Features

– 133 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers + Peripheral Control Registers

– Fully Static Operation

– Up to 16 MIPS Throughput at 16 MHz

– On-chip 2-cycle Multiplier

– 128K Bytes of In-System Self-programmable Flash program memory

– 4K Bytes EEPROM

– 4K Bytes Internal SRAM

– Write/Erase cycles: 10,000 Flash/100,000 EEPROM

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

– Up to 64K Bytes Optional External Memory Space

– Programming Lock for Software Security

– SPI Interface for In-System Programming

– Boundary-scan Capabilities According to the JTAG Standard

– Extensive On-chip Debug Support

– Programming of Flash, EEPROM, Fuses and Lock Bits through the JTAG Interface

– Two 8-bit Timer/Counters with Separate Prescalers and Compare Modes

– Two Expanded 16-bit Timer/Counters with Separate Prescaler, Compare Mode and

Capture Mode

– Real Time Counter with Separate Oscillator

– Two 8-bit PWM Channels

– 6 PWM Channels with Programmable Resolution from 2 to 16 Bits

– Output Compare Modulator

– 8-channel, 10-bit ADC

8 Single-ended Channels

7 Differential Channels

2 Differential Channels with Programmable Gain at 1x, 10x, or 200x

– Byte-oriented Two-wire Serial Interface

– Dual Programmable Serial USARTs

– Master/Slave SPI Serial Interface

– Programmable Watchdog Timer with On-chip Oscillator

– On-chip Analog Comparator

– Power-on Reset and Programmable Brown-out Detection

– Internal Calibrated RC Oscillator

– External and Internal Interrupt Sources

– Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby,

and Extended Standby

– Software Selectable Clock Frequency

– ATmega103 Compatibility Mode Selected by a Fuse

– Global Pull-up Disable

– 53 Programmable I/O Lines

– 64-lead TQFP and 64-pad QFN/MLF

– 2.7 - 5.5V for ATmega128A

– 0 - 16 MHz for ATmega128A

8-bit

Microcontroller

with 128K Bytes

In-System

Programmable

Flash

ATmega128A

Summary

Rev. 8151DS–AVR–07/09