STC micro STC8A8K64D4 Series - Example Routines; EEPROM Basic Operation

STC8A8K64D4 Series Manual
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16.4 Example Routines
16.4.1 EEPROM Basic Operation
C language code
//Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
sfr IAP_DATA = 0xC2;
sfr IAP_ADDRH = 0xC3;
sfr IAP_ADDRL = 0xC4;
sfr IAP_CMD = 0xC5;
sfr IAP_TRIG = 0xC6;
sfr IAP_CONTR = 0xC7;
sfr IAP_TPS = 0xF5;
void IapIdle()
{
IAP_CONTR = 0; //Disable IAP function
IAP_CMD = 0; //Clear command register
IAP_TRIG = 0; //Clear trigger register
IAP_ADDRH = 0x80; //Set the address to a non-IAP area
IAP_ADDRL = 0;
}
char IapRead(int addr)
{
char dat;
IAP_CONTR = 0x80; //Enable IAP
IAP_TPS = 12; //Set the erasing wait parameter of 12MHz
IAP_CMD = 1; //Set IAP read command
IAP_ADDRL = addr; //Set IAP low address
IAP_ADDRH = addr >> 8; //Set IAP high address
IAP_TRIG = 0x5a; //Write trigger command (0x5a)
IAP_TRIG = 0xa5; //Write trigger command (0xa5)
_nop_();
dat = IAP_DATA; //Read IAP data
IapIdle(); //Disable IAP function
return dat;