ATMEGA128A-AU基本信息:
EEPROM存储器容量:4KB
存储器容量, RAM:4KB
计时器数:4
PWM通道数:8
工作温度范围:-40°C to +85°C
针脚数:64
封装类型:TQFP
模数转换器输入数:8
电源电压 最大:5.5V
电源电压 最小:2.7V
表面安装器件:表面安装
输入/输出线数:53
逻辑功能号:128
闪存容量:128KB
ATmega103 and ATMEGA128A-AU Compatibility:
The ATmega128A is a highly complex microcontroller where the number of I/O locations super-sedes the 64 I/O locations reserved in the AVR instruction set. To ensure backward compatibilitywith the ATmega103, all I/O locations present in ATmega103 have the same location in ATmega128A. Most additional I/O locations are added in an Extended I/O space starting from $60 to , (i.e., in the ATmega103 internal RAM space). These locations can be reached by using LD/LDS/LDD and ST/STS/STD instructions only, not by using IN and OUT instructions.The relocation of the internal RAM space may still be a problem for ATmega103 users. Also, the increased number of interrupt vectors might be a problem if the code uses absolute addresses.To solve these problems, an ATmega103 compatibility mode can be selected by programming the fuse M103C. In this mode, none of the functions in the Extended I/O space are in use, so the internal RAM is located as in ATmega103. Also, the Extended Interrupt vectors are removed.
The ATmega128A is 100% pin compatible with ATmega103, and can replace the ATmega103 on current Printed Circuit Boards. The application note “Replacing ATmega103 by ATmega128A” describes what the user should be aware of replacing the ATmega103 by anATmega128A.
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