Mega128 Übersicht


Der Mikrocontroller ATmega128 stammt aus der AVR-Familie von ATMEL. Es handelt sich um einen low-power Mikrocontroller mit Advanced RISC Architecture. Hier folgt eine kurze Zusammenstellung der Hardwareressourcen:


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


Nonvolatile Program and Data Memories

128K Bytes of In-System Reprogrammable Flash

Endurance: 10,000 Write/Erase Cycles

Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program


True Read-While-Write Operation


Endurance: 100,000 Write/Erase Cycles

4K Bytes Internal SRAM

Up to 64K Bytes 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


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 MLF


Operating Voltages

2.7 - 5.5V for ATmega128L

4.5 - 5.5V for ATmega128