Overview
●The 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 approaching 1 MIPS per MHz allowing the system designer to optimize
●power consumption versus processing speed.
●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 executedin one clock cycle. The resulting
●architecture is more code efficient while achieving throughputs up to ten times faster than con
●ventional CISC microcontrollers.
●Features
●• High-performance, Low-power AVR® 8-bit Microcontroller
●• Advanced RISC Architecture
●– 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
●• High Endurance Non-volatile Memory segments
●– 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
●– 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
●– Up to 64K Bytes OptionalExternal 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
●• 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 I/O Lines
●– 64-lead TQFP and 64-pad QFN/MLF
●• Operating Voltages
●– 2.7 - 5.5V
●• Speed Grades
●– 0 - 16 MHz
