“93c46讀寫程序” #include <reg52.h> sbit CS=P2^7; sbit SK=P2^6; sbit DI=P2^5; sbit DO=P2^4; /* extern unsigned char ReadChar(unsigned char address); extern void WriteChar(unsigned char address,unsigned char InData); extern void ReadString(unsigned char data *RamAddress,unsigned char RomAddress, unsigned char Number); extern void WriteString(unsigned char data *RamAddress,unsigned char RomAddress,unsigned char Number); */ // Write enable must precede all programming modes. void Ewen(void) { unsigned char temp,InData; CS=0; SK=0; CS=1; InData=0x98; // 10011XXXX for(temp=9;temp!=0;temp--) { // 9 DI=InData&0x80; SK=1; SK=0; InData<<=1; } CS=0; } // Disables all programming instructions. void Ewds(void) { unsigned char temp,InData; CS=0; SK=0; CS=1; InData=0x80; // 10000XXXX for(temp=9;temp!=0;temp--) { // 9 DI=InData&0x80; SK=1; SK=0; InData<<=1; } CS=0; } // Reads data stored in memory, at specified address. unsigned int Read(unsigned char address) { unsigned char temp; unsigned int result; Ewen(); SK=0; DI=1; // 110 A5-A0 CS=0; CS=1; SK=1; SK=0; // 1 address=address&0x3f 0x80; for(temp=8;temp!=0;temp--) { // 8 DI=address&0x80; SK=1; SK=0; address<<=1; } DO=1; for(temp=16;temp!=0;temp--) { // 16 SK=1; result=(result<<1) DO; SK=0; } CS=0; Ewds(); return(result); } // Writes memory location An - A0. void Write(unsigned char address,unsigned int InData) { unsigned char temp; Ewen(); SK=0; DI=1; // 101 A5-A0 CS=0; CS=1; SK=1; SK=0; // 1 address=address&0x3f 0x40; for(temp=8;temp!=0;temp--) { // 8 DI=address&0x80; SK=1; SK=0; address<<=1; } for(temp=16;temp!=0;temp--) { // 16 |