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The Atmel® ATmega128A 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 ATmega128A achieves throughputs close to 1MIPS per MHz. This empowers system designer to optimize the device for power consumption versus processing speed.

Features
High-performance, Low-power Atmel AVR 8-bit Microcontroller
Advanced RISCArchitecture
-133 Powerful Instructions- Most Single-clock Cycle Execution 32 × 8 General Purpose Working Registers + Peripheral Control Registers
Fully Static Operation
Up to 16MIPS Throughput at 16MHz
On-chip 2-cycle Multiplier
High Endurance Non-volatile Memory segments -128Kbytes of In-System Self-programmable Flash program memory
4Kbytes EEPROM
4Kbytes Internal SRAM
Write/Erase cycles: 10,000 Flash/100,000 EEPROM
Data retention: 20 years at 85"C/100 years at 25C(1)
Optional Boot Code Section with Independent Lock Bits
.In-System Programming by On-chip Boot Program
. True Read-While-Write Operation
Up to 64 Kbytes Optional External Memory Space
-Programming Lock for Software Security 
-SPI Interface for In-System Programming
+ JTAG (IEEE std. 1149.1 Compliant) Interface
- 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
Atmel QTouch library support
-Capacitive touch buttons, sliders and wheels
-Atmel QTouch and QMatrix acquisition
-Up to 64 sense channels
Peripheral Features
- 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
Special Microcontroller Features
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
I/O and Packages
-53 Programmable /O Lines
-64-lead TQFP and 64-pad QFN/MLF
Operating Voltages
2.7-5.5V
Speed Grades
-0-16MHz