c51程序集锦

				//24c01-24c16读写驱动程序，
				sbit a0=ACC^0;			//定义ACC的位，利用ACC操作速度最快
				sbit a1=ACC^1;
				sbit a2=ACC^2;
				sbit a3=ACC^3;
				sbit a4=ACC^4;
				sbit a5=ACC^5;
				sbit a6=ACC^6;
				sbit a7=ACC^7;
				
				void s24(void) {
					_nop_();scl=0;sda=1;scl=1;_nop_();sda=0;_nop_();scl=0;
				}
				void s240(void) {
					_nop_();scl0=0;sda0=1;scl0=1;_nop_();sda0=0;_nop_();scl0=0;
				}
				void p24(void) {
					sda=0;scl=1;_nop_();sda=1;
				}
				void p240(void) {
					sda0=0;scl0=1;_nop_();sda0=1;
				}
				unsigned char rd24(void) {
					sda=1;
					scl=1;a7=sda;scl=0;
					scl=1;a6=sda;scl=0;
					scl=1;a5=sda;scl=0;
					scl=1;a4=sda;scl=0;
					scl=1;a3=sda;scl=0;
					scl=1;a2=sda;scl=0;
					scl=1;a1=sda;scl=0;
					scl=1;a0=sda;scl=0;
					sda=1;scl=1;scl=0;
					return(ACC);
				}
				
				void wd24(unsigned char dd) {
					ACC=dd;
					sda=a7;scl=1;scl=0;
					sda=a6;scl=1;scl=0;
					sda=a5;scl=1;scl=0;
					sda=a4;scl=1;scl=0;
					sda=a3;scl=1;scl=0;
					sda=a2;scl=1;scl=0;
					sda=a1;scl=1;scl=0;
					sda=a0;scl=1;scl=0;
					sda=1;scl=1;
				}
				
				unsigned char read(unsigned int address){
					unsigned char dd;
					dd=((address&0x7ff)/256)					s24();wd24(0xa0|dd);scl=0;wd24(address);scl=0;
					s24();wd24(0xa1|dd);scl=0;dd=rd24();p24();return(dd);
				}
				
				void write(unsigned int address,unsigned char dd){
					unsigned char ddd;
					ddd=((address&0x7ff)/256)					s24();wd24(0xa0|ddd);scl=0;wd24(address);scl=0;wd24(dd);scl=0;p24();
					time=0;					//time为定时器时间参考，time增加1代表1ms,如果没有用定时器，取消该行
					while (1) {
						s24();
						wd24(0xa0|ddd);
						sda=1;
						if (sda==0) break;
						if (time>10) break;	//此行防止由于eeprom器件损坏后的死循环
						scl=0;
					}
				}