ATmega8A Low-Power AVR 8-bit Microcontroller Data Sheet Summary Introduction The ATmega8A is a low-power CMOS 8-bit microcontroller based on the AVR® enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8A achieves throughputs close to 1 MIPS per MHz. This empowers system designers to optimize the device for power consumption versus processing speed. Features • High-performance, Low-power AVR 8-bit Microcontroller • Advanced RISC Architecture – 130 powerful instructions - most single-clock cycle execution – 32 x 8 general purpose working registers – Fully static operation – Up to 16 MIPS throughput at 16 MHz – On-chip 2-cycle multiplier • High Endurance Nonvolatile Memory segments – 8 KB of In-System Self-programmable Flash program memory – 512B EEPROM – 1 KB internal SRAM – Write/erase cycles: 10,000 Flash/100,000 EEPROM – Data retention: 20 years at 85°C/100 years at 25°C(1) – Optional boot code section with independent lock bits • In-system programming by on-chip boot program • True read-while-write operation – Programming lock for software security • Microchip QTouch® library support – Capacitive touch buttons, sliders and wheels – QTouch and QMatrix acquisition – Up to 64 sense channels • Peripheral Features – Two 8-bit timer/counters with separate prescaler, one compare mode – One 16-bit timer/counter with separate prescaler, compare mode, and capture mode – Real-time counter with separate oscillator – Three PWM channels – 8-channel ADC in TQFP and QFN/MLF package © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 1

ATmega8A • Eight channels 10-bit accuracy – 6-channel ADC in PDIP package • Six channels 10-bit accuracy – Byte-oriented two-wire serial interface – Programmable serial USART – Master/slave SPI serial interface – Programmable watchdog timer with separate on-chip oscillator – On-chip analog comparator • Special Microcontroller Features – Power-on Reset and programmable Brown-out Detection – Internal calibrated RC oscillator – External and internal interrupt sources – Five sleep modes: Idle, ADC noise reduction, power-save, power-down, and standby • I/O and Packages – 23 programmable I/O lines – 28-lead PDIP, 32-lead TQFP, and 32-pad QFN/MLF • Operating Voltages – 2.7 - 5.5V • Speed Grades – 0 - 16 MHz • Power Consumption at 4 MHz, 3V, 25°C – Active: 3.6 mA – Idle mode: 1.0 mA – Power-down mode: 0.5 μA © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 2

Table of Contents Introduction......................................................................................................................1 Features..........................................................................................................................1 1. Description.................................................................................................................5 2. Configuration Summary.............................................................................................6 3. Ordering Information..................................................................................................7 4. Block Diagram...........................................................................................................8 5. Pin Configurations.....................................................................................................9 6. I/O Multiplexing........................................................................................................12 7. Resources...............................................................................................................14 8. Data Retention.........................................................................................................15 9. About Code Examples.............................................................................................16 10.Capacitive Touch Sensing.......................................................................................17 10.1. QTouch Library...........................................................................................................................17 11. Packaging Information.............................................................................................18 11.1. 32-pin 32A..................................................................................................................................18 11.2. 28-pin 28P3................................................................................................................................19 11.3. 32-pin 32M1-A............................................................................................................................20 12.Errata.......................................................................................................................21 12.1. ATmega8A, rev. L.......................................................................................................................21 13.Appendix A: Revision History..................................................................................23 The Microchip Web Site................................................................................................24 Customer Change Notification Service..........................................................................24 Customer Support.........................................................................................................24 Microchip Devices Code Protection Feature.................................................................24 Legal Notice...................................................................................................................25 Trademarks...................................................................................................................25 © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 3

ATmega8A Quality Management System Certified by DNV.............................................................26 Worldwide Sales and Service........................................................................................27 © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 4

ATmega8A Description 1. Description The AVR® core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers. The ATmega8A provides the following features: 8 KB of In-System Programmable Flash with Read- While-Write capabilities, 512 B of EEPROM, 1 KB of SRAM, 23 general purpose I/O lines, 32 general purpose working registers, three flexible timer/counters with compare modes, internal and external interrupts, a serial programmable USART, one byte oriented two-wire serial interface, a 6-channel ADC (eight channels in TQFP and QFN/MLF packages) with 10-bit accuracy, a programmable Watchdog timer with internal oscillator, an SPI serial port, and five software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, timer/counters, one SPI port, and interrupt system to continue functioning. The Power-down mode saves the register contents but freezes the oscillator, disabling all other chip functions until the next Interrupt or Hardware Reset. In Power-save mode, the asynchronous timer continues to run, allowing the user to maintain a timer base while the rest of the device is sleeping. The ADC Noise Reduction mode stops the CPU and all I/O modules except asynchronous timer and ADC, to minimize switching noise during ADC conversions. In Standby mode, the crystal/resonator oscillator is running while the rest of the device is sleeping. This allows very fast start-up combined with low-power consumption. Microchip offers the QTouch library for embedding capacitive touch buttons, sliders and wheels functionality into AVR microcontrollers. The patented charge-transfer signal acquisition offers robust sensing and includes fully debounced reporting of touch keys and includes Adjacent Key SuppressionTM (AKSTM) technology for unambiguous detection of key events. The easy-to-use QTouch Composer allows you to explore, develop and debug your own touch applications. The device is manufactured using Microchip’s high density nonvolatile memory technology. The on-chip ISP Flash allows the program memory to be reprogrammed In-System through an SPI serial interface, by a conventional nonvolatile memory programmer, or by an on-chip Boot program running on the AVR core. The Boot program can use any interface to download the application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation. By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the ATmega8A is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications. The device is supported with a full suite of program and system development tools including: C Compilers, macro assemblers, program debugger/simulators, In-Circuit Emulators, and evaluation kit. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 5

ATmega8A Configuration Summary 2. Configuration Summary Features ATmega8A Pin count 32 Flash (KB) 8 SRAM (KB) 1 EEPROM (Bytes) 512 General Purpose I/O pins 23 SPI 1 TWI (I2C) 1 USART 1 ADC 10-bit 15 ksps ADC channels 6 (8 in TQFP and QFN/MLF packages) AC propagation delay Typ 400 ns 8-bit Timer/Counters 2 16-bit Timer/Counters 1 PWM channels 3 RC Oscillator +/-3% Operating voltage 2.7 - 5.5V Max operating frequency 16 MHz Temperature range -40°C to +105°C © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 6

ATmega8A Ordering Information 3. Ordering Information Speed (MHz) Power Supply Ordering Code(2) Package(1) Operational Range ATmega8A-AU 32A ATmega8A-AUR(3) 32A ATmega8A-PU 28P3 Industrial (-40oC to 85oC) ATmega8A-MU 32M1-A ATmega8A-MUR(3) 32M1-A 16 2.7 - 5.5V ATmega8A-AN 32A ATmega8A-ANR(3) 32A ATmega8A-MN 32M1-A Extended (-40oC to 105oC) ATmega8A-MNR(3) 32M1-A ATmega8A-PN 28P3 Note:  1. This device can also be supplied in wafer form. Please contact your local Microchip sales office for detailed ordering information and minimum quantities. 2. Pb-free packaging, complies to the European Directive for Restriction of Hazardous Substances (RoHS directive). Also Halide free and fully Green. 3. Tape and Reel Package Type 32A 32-lead, Thin (1.0mm) Plastic Quad Flat Package (TQFP) 28P3 28-lead, 0.300” Wide, Plastic Dual Inline Package (PDIP) 32M1-A 32-pad, 5 x 5 x 1.0mm body, lead pitch 0.50mm, Quad Flat No-Lead/Micro Lead Frame Package (QFN/MLF) © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 7

ATmega8A Block Diagram 4. Block Diagram Figure 4-1. Block Diagram ® SRAM CPU FLASH XTAL1/ Clock generation Power TOSC1 EEPROMIF 8 MHz 1/2/4/8MHz management EEPROM Crystal Osc Calib RC and clock XTAL2/ 12MHz control TOSC2 External 32.768kHz RC Osc XOSC NVM programming External 1MHz int PARPROG clock osc D Serial A Programming T VCC Watchdog A MISO Power Timer B SPI MOSI Supervision U SCK RESET SS POR/BOD & S Internal RESET GND Reference I/O PB[7:0] PC[6:0] PORTS PD[7:0] ADC[7:0] ADC AREF EXTINT INT[1:0] AIN0 AIN1 AC ADCMUX TC 0 T0 (8-bit) RxD TxD USART TC 1 OC1A/B XCK T1 (16-bit) ICP1 SDA TWI SCL TC 2 OC2 (8-bit async) © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 8

ATmega8A Pin Configurations 5. Pin Configurations Figure 5-1. PDIP (RESET) PC6 1 28 PC5 (ADC5/SCL) (RXD) PD0 2 27 PC4 (ADC4/SDA) (TXD) PD1 3 26 PC3 (ADC3) (INT0) PD2 4 25 PC2 (ADC2) (INT1) PD3 5 24 PC1 (ADC1) (XCK/T0) PD4 6 23 PC0 (ADC0) VCC 7 22 GND GND 8 21 AREF (XTAL1/TOSC1) PB6 9 20 AVCC (XTAL2/TOSC2) PB7 10 19 PB5 (SCK) (T1) PD5 11 18 PB4 (MISO) (AIN0) PD6 12 17 PB3 (MOSI/OC2) (AIN1) PD7 13 16 PB2 (SS/OC1B) (ICP1) PB0 14 15 PB1 (OC1A) © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 9

ATmega8A Pin Configurations Figure 5-2. TQFP Top View L) A) C D ) S S T / / ) ) 0) D) D) E C5 C4 C3 C2 T S N X X E D D D D T R R A A A A I ( ( ( ( ( ( ( ( 2 1 0 6 5 4 3 2 D D D C C C C C P P P P P P P P 2 1 0 9 8 7 6 5 3 3 3 2 2 2 2 2 (INT1) PD3 1 24 PC1 (ADC1) (XCK/T0) PD4 2 23 PC0 (ADC0) GND 3 22 ADC7 VCC 4 21 GND GND 5 20 AREF VCC 6 19 ADC6 (XTAL1/TOSC1) PB6 7 18 AVCC (XTAL2/TOSC2) PB7 8 17 PB5 (SCK) 9 10 11 12 13 14 15 16 D5 D6 D7 B0 B1 B2 B3 B4 T1) P N0) P N1) P P1) P 1A) P 1B) P C2) P SO) P ( (AI (AI (IC (OC S/OC OSI/O (MI S ( M ( © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 10

ATmega8A Pin Configurations Figure 5-3. MLF Top View L) A) C D ) S S T / / ) ) 0) D) D) E C5 C4 C3 C2 T S N X X E D D D D T R R A A A A I ( ( ( ( ( ( ( ( 2 1 0 6 5 4 3 2 D D D C C C C C P P P P P P P P 2 1 0 9 8 7 6 5 3 3 3 2 2 2 2 2 (INT1) PD3 1 24 PC1 (ADC1) (XCK/T0) PD4 2 23 PC0 (ADC0) GND 3 22 ADC7 VCC 4 21 GND GND 5 20 AREF VCC 6 19 ADC6 (XTAL1/TOSC1) PB6 7 18 AVCC (XTAL2/TOSC2) PB7 8 17 PB5 (SCK) 0 1 2 3 4 5 6 9 1 1 1 1 1 1 1 NOTE: The large center pad underneath the MLFpackages is made of 5 6 7 0 1 2 3 4 metal and internallyconnected to D D D B B B B B GND. It should be solderedor P P P P P P P P glued to the PCB to ensure good ) ) ) ) ) ) ) ) mpaedc hisalneifct aul nsctaobninlietyt.e Idf ,t hthee center 1 0 1 1 A B 2 O package mightloosen from the T N N P 1 1 C S PCB. ( I I C C C O I (A (A (I (O S/O OSI/ (M S ( M ( © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 11

ATmega8A I/O Multiplexing 6. I/O Multiplexing Each pin is by default controlled by the PORT as a general purpose I/O and alternatively it can be assigned to one of the peripheral functions. The following table describes the peripheral signals multiplexed to the PORT I/O pins. Table 6-1. 32-Pin TQFP and MLF: PORT Function Multiplexing No PAD32 EXTINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI 1 PD[3] INT1 2 PD[4] T0 XCK0 3 GND 4 VCC 5 GND 6 VCC 7 PB[6] XTAL1/TOSC1 8 PB[7] XTAL2/TOSC2 9 PD[5] T1 10 PD[6] AIN0 11 PD[7] AIN1 12 PB[0] ICP1 13 PB[1] OC1A 14 PB[2] OC1B SS0 15 PB[3] OC2 MOSI0 16 PB[4] MISO0 17 PB[5] SCK0 18 AVCC 19 ADC6 ADC6 20 AREF 21 GND 22 ADC7 ADC7 23 PC[0] ADC0 24 PC[1] ADC1 25 PC[2] ADC2 26 PC[3] ADC3 27 PC[4] ADC4 SDA0 28 PC[5] ADC5 SCL0 29 PC[6]/RESET 30 PD[0] RXD0 © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 12

ATmega8A I/O Multiplexing No PAD32 EXTINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI 31 PD[1] TXD0 32 PD[2] INT0 Table 6-2. 28-Pin PDIP: PORT Function Multiplexing No PAD28 EXTINT ADC/AC OSC T/C # 0 T/C # 1 USART I2C SPI 1 PC[6]/RESET 2 PD[0] RXD0 3 PD[1] TXD0 4 PD[2] INT0 5 PD[3] INT1 6 PD[4] T0 XCK0 7 VCC 8 GND 9 PB[6] XTAL1/TOSC1 10 PB[7] XTAL2/TOSC2 11 PD[5] T1 12 PD[6] AIN0 13 PD[7] AIN1 14 PB[0] ICP1 15 PB[1] OC1A 16 PB[2] OC1B SS0 17 PB[3] OC2 MOSI0 18 PB[4] MISO0 19 PB[5] SCK0 20 AVCC 21 AREF 22 GND 23 PC[0] ADC0 24 PC[1] ADC1 25 PC[2] ADC2 26 PC[3] ADC3 27 PC[4] ADC4 SDA0 28 PC[5] ADC5 SCL0 © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 13

ATmega8A Resources 7. Resources A comprehensive set of development tools, application notes and datasheets are available for download on http://www.microchip.com/design-centers/8-bit . © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 14

ATmega8A Data Retention 8. Data Retention Reliability qualification results show that the projected data retention failure rate is much less than 1 PPM over 20 years at 85°C or 100 years at 25°C. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 15

ATmega8A About Code Examples 9. About Code Examples This datasheet contains simple code examples that briefly show how to use various parts of the device. These code examples assume that the part specific header file is included before compilation. Be aware that not all C compiler vendors include bit definitions in the header files and interrupt handling in C is compiler dependent. Please confirm with the C compiler documentation for more details. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 16

ATmega8A Capacitive Touch Sensing 10. Capacitive Touch Sensing 10.1 QTouch Library The QTouch® library provides a simple to use solution to realize touch sensitive interfaces on most AVR® microcontrollers. The QTouch library includes support for the QTouch and QMatrix™ acquisition methods. Touch sensing can be added to any application by linking the appropriate QTouch library for the AVR microcontroller. This is done by using a simple set of APIs to define the touch channels and sensors, and then calling the touch sensing API’s to retrieve the channel information and determine the touch sensor states. The QTouch library is FREE and downloadable from QTouch Library . For implementation details and other information, refer to the QTouch Library User Guide, also available for download from the Microchip website. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 17

ATmega8A Packaging Information 11. Packaging Information 11.1 32-pin 32A Note:  Note: For the most current package drawings, see the Microchip Packaging Specification located at http:// www.microchip.com/packaging PIN 1 IDENTIFIER PIN 1 B e E1 E D1 D C 0°~7° A1 A2 A L COMMON DIMENSIONS (Unit of measure = mm) SYMBOL MIN NOM MAX NOTE A – – 1.20 A1 0.05 – 0.15 A2 0.95 1.00 1.05 D 8.75 9.00 9.25 D1 6.90 7.00 7.10 Note 2 E 8.75 9.00 9.25 Notes: 1. This package conforms to JEDEC reference MS-026, Variation ABA. E1 6.90 7.00 7.10 Note 2 2. Dimensions D1 and E1 do not include mold protrusio n. Allowable B 0 .30 – 0.45 protrusion is 0.25mm per side. Dimensions D1 and E1 are maximum C 0.09 – 0.20 plastic body size dimensions including mold mismatch. 3. Lead coplanarity is 0.10mm maximum. L 0.45 – 0.75 e 0.80 TYP 2010-10-20 TITLE DRAWING NO. REV. 32A, 32-lead, 7 x 7mm body size, 1.0mm body thickness, 32A C 0.8mm lead pitch, thin profile plastic quad flat package (TQFP) © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 18

ATmega8A Packaging Information 11.2 28-pin 28P3 Note:  Note: For the most current package drawings, see the Microchip Packaging Specification located at http:// www.microchip.com/packaging D PIN 1 E1 A SEATING PLANE A1 L B2 B (4 PLACES) B1 e E COMMON DIMENSIONS 0º ~ 15º REF (Unit of Measure = mm) C SYMBOL MIN NOM MAX NOTE eB A – – 4.5724 A1 0.508 – – D 34.544 – 34.798 Note 1 E 7.620 – 8.255 E1 7.112 – 7.493 Note 1 B 0.381 – 0.533 B1 1.143 – 1.397 Note: 1. Dimensions D and E1 do not include mold Flash or Protrusion. Mold Flash or Protrusion shall not exceed 0.25mm (0.010"). B2 0.762 – 1.143 L 3.175 – 3.429 C 0.203 – 0.356 eB – – 10.160 e 2.540 TYP 09/28/01 TITLE DRAWING NO. REV. 2325 Orchard Parkway 28P3, 2 8-lead (0.300"/7.62mm Wide) Plastic Dual San Jose, CA 95131 Inline Package (PDIP) 28P3 B © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 19

ATmega8A Packaging Information 11.3 32-pin 32M1-A Note:  Note: For the most current package drawings, see the Microchip Packaging Specification located at http:// www.microchip.com/packaging D D1 1 0 2 3 Pin 1 ID E1 E SIDE VIEW TOP VIEW A3 A2 A1 A K 0.08C COMMON DIMENSIONS P (Unit of Measure = mm) D2 SYMBOL MIN NOM MAX NOTE A 0.80 0.90 1.00 1 A1 – 0.02 0.05 P Pin #1 Notch 2 A2 – 0.65 1.00 (0.20 R) 3 A3 0.20 REF E2 b 0.18 0.23 0.30 K D 4.9 0 5.00 5.10 D1 4.7 0 4.75 4.80 D2 2.95 3.10 3.25 E 4.90 5.00 5.10 b e L E1 4.70 4.75 4.80 BOTTOM VIEW E2 2.95 3.10 3.25 e 0.50 BSC L 0.30 0.40 0.50 P – – 0.60 0 – – 12o Note: JEDEC Standard MO-220, Fig. 2 (Anvil Singulation), VHHD-2. K 0.20 – – 03/14/2014 32M1-A , 32-pad, 5 x 5 x 1.0mm Body, Lead Pitch 0.50mm, 3.10mm Exposed Pad, Micro Lead Frame Package (MLF) 32M1-A F © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 20

ATmega8A Errata 12. Errata The revision letter in this section refers to the revision of the ATmega8A device. 12.1 ATmega8A, rev. L • First Analog Comparator conversion may be delayed • Interrupts may be lost when writing the timer registers in the asynchronous timer • Signature may be Erased in Serial Programming Mode • CKOPT Does not Enable Internal Capacitors on XTALn/TOSCn Pins when 32kHz Oscillator is Used to Clock the Asynchronous Timer/Counter2 • Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request 1. First Analog Comparator conversion may be delayed If the device is powered by a slow rising V , the first analog comparator conversion will take CC longer than expected on some devices. Problem Fix / Workaround: When the device has been powered or reset, disable then enable the analog comparator before the first conversion. 2. Interrupts may be lost when writing the timer registers in the asynchronous timer The interrupt will be lost if a timer register that is synchronous timer clock is written when the asynchronous Timer/Counter register (TCNTx) is 0x00. Problem Fix / Workaround: Always check that the asynchronous Timer/Counter register neither have the value 0xFF nor 0x00 before writing to the asynchronous Timer Control Register (TCCRx), asynchronous Timer Counter Register (TCNTx), or asynchronous Output Compare Register (OCRx). 3. Signature may be Erased in Serial Programming Mode If the signature bytes are read before a chiperase command is completed, the signature may be erased causing the device ID and calibration bytes to disappear. This is critical, especially, if the part is running on internal RC oscillator. Problem Fix / Workaround: Ensure that the chiperase command has exceeded before applying the next command. 4. CKOPT Does not Enable Internal Capacitors on XTALn/TOSCn Pins when 32kHz Oscillator is Used to Clock the Asynchronous Timer/Counter2 When the internal RC oscillator is used as the main clock source, it is possible to run the Timer/ Counter2 asynchronously by connecting a 32kHz Oscillator between XTAL1/TOSC1 and XTAL2/ TOSC2. But when the internal RC oscillator is selected as the main clock source, the CKOPT fuse does not control the internal capacitors on XTAL1/TOSC1 and XTAL2/TOSC2. As long as there are no capacitors connected to XTAL1/TOSC1 and XTAL2/TOSC2, safe operation of the oscillator is not guaranteed. Problem Fix / Workaround: Use external capacitors in the range of 20 - 36 pF on XTAL1/TOSC1 and XTAL2/TOSC2. This will be fixed in ATmega8A Rev. G where the CKOPT Fuse will control internal capacitors also when internal RC oscillator is selected as main clock source. For ATmega8A Rev. G, CKOPT = 0 (programmed) will enable the internal capacitors on XTAL1 and XTAL2. Customers who want © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 21

ATmega8A Errata compatibility between Rev. G and older revisions, must ensure that CKOPT is unprogrammed (CKOPT = 1). 5. Reading EEPROM by using ST or STS to set EERE bit triggers unexpected interrupt request. Reading EEPROM by using the ST or STS command to set the EERE bit in the EECR register triggers an unexpected EEPROM interrupt request. Problem Fix / Workaround: Always use OUT or SBI to set EERE in EECR. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 22

ATmega8A Appendix A: Revision History 13. Appendix A: Revision History Revision A (January 2018) • Atmel document number 8159FS is now Microchip DS40001991A. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 23

ATmega8A The Microchip Web Site Microchip provides online support via our web site at http://www.microchip.com/. This web site is used as a means to make files and information easily available to customers. Accessible by using your favorite Internet browser, the web site contains the following information: • Product Support – Data sheets and errata, application notes and sample programs, design resources, user’s guides and hardware support documents, latest software releases and archived software • General Technical Support – Frequently Asked Questions (FAQ), technical support requests, online discussion groups, Microchip consultant program member listing • Business of Microchip – Product selector and ordering guides, latest Microchip press releases, listing of seminars and events, listings of Microchip sales offices, distributors and factory representatives Customer Change Notification Service Microchip’s customer notification service helps keep customers current on Microchip products. Subscribers will receive e-mail notification whenever there are changes, updates, revisions or errata related to a specified product family or development tool of interest. To register, access the Microchip web site at http://www.microchip.com/. Under “Support”, click on “Customer Change Notification” and follow the registration instructions. Customer Support Users of Microchip products can receive assistance through several channels: • Distributor or Representative • Local Sales Office • Field Application Engineer (FAE) • Technical Support Customers should contact their distributor, representative or Field Application Engineer (FAE) for support. Local sales offices are also available to help customers. A listing of sales offices and locations is included in the back of this document. Technical support is available through the web site at: http://www.microchip.com/support Microchip Devices Code Protection Feature Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. • Microchip is willing to work with the customer who is concerned about the integrity of their code. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 24

ATmega8A • Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Legal Notice Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer’s risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights unless otherwise stated. Trademarks The Microchip name and logo, the Microchip logo, AnyRate, AVR, AVR logo, AVR Freaks, BeaconThings, BitCloud, CryptoMemory, CryptoRF, dsPIC, FlashFlex, flexPWR, Heldo, JukeBlox, KeeLoq, KeeLoq logo, Kleer, LANCheck, LINK MD, maXStylus, maXTouch, MediaLB, megaAVR, MOST, MOST logo, MPLAB, OptoLyzer, PIC, picoPower, PICSTART, PIC32 logo, Prochip Designer, QTouch, RightTouch, SAM-BA, SpyNIC, SST, SST Logo, SuperFlash, tinyAVR, UNI/O, and XMEGA are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. ClockWorks, The Embedded Control Solutions Company, EtherSynch, Hyper Speed Control, HyperLight Load, IntelliMOS, mTouch, Precision Edge, and Quiet-Wire are registered trademarks of Microchip Technology Incorporated in the U.S.A. Adjacent Key Suppression, AKS, Analog-for-the-Digital Age, Any Capacitor, AnyIn, AnyOut, BodyCom, chipKIT, chipKIT logo, CodeGuard, CryptoAuthentication, CryptoCompanion, CryptoController, dsPICDEM, dsPICDEM.net, Dynamic Average Matching, DAM, ECAN, EtherGREEN, In-Circuit Serial Programming, ICSP, Inter-Chip Connectivity, JitterBlocker, KleerNet, KleerNet logo, Mindi, MiWi, motorBench, MPASM, MPF, MPLAB Certified logo, MPLIB, MPLINK, MultiTRAK, NetDetach, Omniscient Code Generation, PICDEM, PICDEM.net, PICkit, PICtail, PureSilicon, QMatrix, RightTouch logo, REAL ICE, Ripple Blocker, SAM-ICE, Serial Quad I/O, SMART-I.S., SQI, SuperSwitcher, SuperSwitcher II, Total Endurance, TSHARC, USBCheck, VariSense, ViewSpan, WiperLock, Wireless DNA, and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. Silicon Storage Technology is a registered trademark of Microchip Technology Inc. in other countries. GestIC is a registered trademark of Microchip Technology Germany II GmbH & Co. KG, a subsidiary of Microchip Technology Inc., in other countries. All other trademarks mentioned herein are property of their respective companies. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 25

ATmega8A © 2018, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. ISBN: 978-1-5224-2599-1 Quality Management System Certified by DNV ISO/TS 16949 Microchip received ISO/TS-16949:2009 certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona; Gresham, Oregon and design centers in California and India. The Company’s quality system processes and procedures are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, nonvolatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001:2000 certified. © 2018 Microchip Technology Inc. Datasheet Summary 40001991A-page 26

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Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M icrochip: ATMEGA8A-ANR ATMEGA8A-AUR ATMEGA8A-MN ATMEGA8A-MNR ATMEGA8A-MUR ATMEGA8A-PN ATMEGA8A-AU ATMEGA8A-MU ATMEGA8A-PU ATMEGA8A-AN