ATmega328p Xplained Mini EEPROM的读写

ddllxxrr

根据数据手册上说,ATmega328P应带有1K的EEPROM,那么好不好用呢，今天来试一下。
数据手册上关于EEPROM有三个寄存器。
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
256/512/512/1Kbytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
255/511/511/1023. The initial value of EEAR is undefined. A proper value must be written before the EEPROM
may be accessed.
EEDR – The EEPROM Data Register
EECR – The EEPROM Control Register
然后，打开Studio6.2加入以下函数。
见程序清单：
#define  F_CPU 8000000UL#include <avr/io.h>#include <util/delay.h>void EEPROM_write(unsigned int uiAddress, unsigned char ucData){        /* Wait for completion of previous write */        while(EECR & (1<<EEPE))        ;        /* Set up address and Data Registers */        EEAR = uiAddress;        EEDR = ucData;        /* Write logical one to EEMPE */        EECR |= (1<<EEMPE);        /* Start eeprom write by setting EEPE */        EECR |= (1<<EEPE);}unsigned char EEPROM_read(unsigned int uiAddress){        /* Wait for completion of previous write */        while(EECR & (1<<EEPE))        ;        /* Set up address register */        EEAR = uiAddress;        /* Start eeprom read by writing EERE */        EECR |= (1<<EERE);        /* Return data from Data Register */        return EEDR;} unsigned char what;int main(void){            EEPROM_write(50,0x55);        what = EEPROM_read(50);        EEPROM_write(51,0x56);        what = EEPROM_read(51);        EEPROM_write(52,0x57);        what = EEPROM_read(57);        while(1)    {            }}运行结果如下：

经过计算器检查，0x56十进制就是86，一点错也没有