PIC12F617 关于内部FLASH的操作

void flash_write(unsigned short addr,unsigned int value) //写FLASH函数
{
unsigned char i;
for(i=0;i<4;i++)
{
PMADRL=(((addr)&0xfc)|i); //低地址时序操作，需要连续四次的写入缓冲操作，当执行到第四次时，

//硬件会自动擦除相应FLASH然后写入
PMADRH=((addr)>>8);
PMDATH=((value)>>8);
PMDATL=((value)&0xff);
WREN=1;
GIE = 0; //关中断
PMCON2 = 0x55;
PMCON2 = 0xaa; //固定操作
WR=1;
NOP();
NOP();
WREN=0;
GIE = 1; //开中断
}
}

unsigned int flash_read(unsigned short addr) //读FALSH函数
{
unsigned int val;
PMADRL=(addr)&0xff;
PMADRH=(addr)>>8;
//WREN=0;
GIE = 0; //关中断
PMCON1 |= 0x80;
RD=1;
NOP();
NOP();
val = ((PMDATH << 8) | PMDATL);
GIE = 1; //开中断
return val;
}