注意切换时要在Ｐ页操作。
- #include <REG_MA82G5B32.H>
- void delay(unsigned int t)
- {
- unsigned int data i;
- while(t--)
- {
- for(i=0;i<500;i++)
- {
- ;
- }
- }
- }
- /***********************************************************************
- * Function：Page_P_SFR_Write
- *
- * Description: 写P页寄存器
- *
- * Input: SFR,P页SFR的地址， dat，要写入的数据
- *
- * Output: None
- *
- * Return: None
- **********************************************************************/
- void Page_P_SFR_Write(unsigned char SFR,unsigned char dat)
- {
- bit EA_tmp = EA;
- EA = 0;
- IFADRH=0X00;
- ISPCR |= 0x80;
- IFMT = 4;
- IFADRL = SFR;
- IFD = dat;
- SCMD = 0X46;
- SCMD = 0XB9;
- IFMT = 0;
- ISPCR &= 0x7f;
- IFADRH = 0XFF;
- EA = EA_tmp;
- }
- /***********************************************************************
- * Function：Page_P_SFR_Read
- *
- * Description: 读P页寄存器
- *
- * Input: SFR,P页SFR的地址
- *
- * Output: None
- *
- * Return: 读到的P页SFR寄存器的值
- **********************************************************************/
- unsigned char Page_P_SFR_Read(unsigned char SFR)
- {
- bit EA_tmp = EA;
- EA = 0;
- IFADRH=0X00;
- ISPCR |= 0x80;
- IFMT = 5;
- IFADRL = SFR;
- SCMD = 0X46;
- SCMD = 0XB9;
- IFMT = 0;
- ISPCR &= 0x7f;
- IFADRH = 0XFF;
- EA = EA_tmp;
- return IFD;
- }
- void main(void)
- {
- unsigned char tmp;
-
- tmp=Page_P_SFR_Read(0x4c); //读DCON0（P页寄存器0X4C）
- Page_P_SFR_Write(0x4c,tmp&0xFC);//切换P44,P45为IO。由于P44,P45默认为仿真口，
- //要做为普通IO时写DCON0, 清零bit0 OCDE=0; P44,P45,P47为IO
-
- while(1)
- {
- P44=~P44;
- P45=~P45;
- delay(1000);
- }
- }
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