Atmel ATmega128
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| Atmel ATmega128 | |
|---|---|
| Name | ATmega128 |
| Manufacturer | Atmel |
| Family | AVR |
| Core | AVR RISC |
| Flash | 128 KB |
| Ram | 4 KB |
| Eeprom | 4 KB |
| Speed | 16 MHz |
Atmel ATmega128 The Atmel ATmega128 is an 8-bit microcontroller from Atmel's AVR family used in embedded systems, prototyping, and educational projects. It combines on-chip non-volatile memory with a rich peripheral set suitable for applications ranging from industrial control to consumer electronics. The device appears in hobbyist platforms and industrial products and is supported by a broad ecosystem of development tools and documentation.
Overview
The ATmega128 integrates 128 KB of flash memory, 4 KB of SRAM, and 4 KB of EEPROM in a single-chip CMOS package, offering a Harvard architecture with separate program and data buses. Designed by Atmel and later associated with Microchip Technology, it competes with microcontrollers from Intel and Texas Instruments and is often compared alongside devices from NXP and STMicroelectronics. The chip is widely cited in academic curricula at institutions like Massachusetts Institute of Technology, Stanford University, and University of California, Berkeley, and appears in projects shared on platforms such as GitHub, Hackaday, and Instructables.
Architecture
The core is an 8-bit AVR RISC CPU with 32 general-purpose registers, a three-stage pipeline, and single-cycle execution for most instructions, reflecting RISC principles explored in architectures like ARM and MIPS. Memory-mapped I/O and the Harvard architecture separate flash program memory from SRAM, a design choice also present in processors from Zilog and Motorola. The instruction set supports arithmetic, logical, control-flow, and bit-manipulation operations, drawing conceptual parallels to the work of John von Neumann and the designs used in early computing at IBM and Bell Labs.
Peripherals and Features
On-chip peripherals include multiple 16-bit timers/counters, PWM channels, USART, SPI, and TWI (I²C) interfaces, enabling connectivity with sensors and devices from Bosch, Honeywell, and Texas Instruments. The analog subsystem includes ADC channels suitable for interfacing with transducers used in projects by NASA and CERN experiments. Power management features facilitate battery-powered designs popular in products from Apple and Samsung, and the watchdog timer and Brown-out Detection are reliability features often required in automotive systems developed by Bosch and Continental.
Development and Toolchain
Development for the ATmega128 is supported by software toolchains such as GNU GCC, AVR-GCC, and toolchains from Microchip and Segger, alongside IDEs including Atmel Studio and Eclipse-based environments. Hardware debugging and programming tools include JTAGICE, AVR ISP mkII, and Atmel-ICE, while bootloaders and example code are frequently hosted on SourceForge and GitHub alongside libraries like avr-libc. University courses at Carnegie Mellon and ETH Zürich often use the AVR toolchain in embedded systems labs, and communities on Stack Overflow and Reddit provide peer support.
Applications and Use Cases
The ATmega128 is used in robotics projects connected to ROS and Arduino-based ecosystems, industrial controllers in PLC-like designs, and consumer devices implementing user interfaces similar to those in Sony and Panasonic products. It is found in instrumentation for laboratory equipment at institutions such as Johns Hopkins University and Imperial College London, and in open-source hardware like RepRap 3D printers and DIY drones influenced by projects from OpenPilot and PX4.
Variants and Package Options
The ATmega128 is available in multiple packages including PDIP, TQFP, and QFN, comparable to offerings from NXP and STMicroelectronics for devices like the LPC1768 and STM32F103. Variants in the AVR lineup include devices with differing memory configurations and pin counts similar to the ATmega64 and ATmega2560, and third-party vendors supply compatible sockets and carrier boards often used by Arduino and BeagleBoard-compatible projects.