STC micro STC8A8K64D4 Series - I 2 C Is Used to Access AT24 C256 in Master Mode AT24 C256 (Polling Mode)

STC8A8K64D4 Series Manual
- 601 -
CALL SENDDATA
CALL RECVACK
MOV A,#000H ;Send storage address high byte
CALL SENDDATA
CALL RECVACK
MOV A,#000H ;Send storage address low byte
CALL SENDDATA
CALL RECVACK
CALL START ;Send start command
MOV A,#0A1H ;Send device address + read command
CALL SENDDATA
CALL RECVACK
CALL RECVDATA ;Read data 1
MOV P0,A
CALL SENDACK
CALL RECVDATA ;Read data 2
MOV P2,A
CALL SENDNAK
CALL STOP ;Send stop command
JMP $
END
21.5.2 I
2
C is Used to Access AT24C256 in Master Mode AT24C256
(Polling Mode)
C language code
//Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P_SW2 = 0xba;
#define I2CCFG (*(unsigned char volatile xdata *)0xfe80)
#define I2CMSCR (*(unsigned char volatile xdata *)0xfe81)
#define I2CMSST (*(unsigned char volatile xdata *)0xfe82)
#define I2CSLCR (*(unsigned char volatile xdata *)0xfe83)
#define I2CSLST (*(unsigned char volatile xdata *)0xfe84)
#define I2CSLADR (*(unsigned char volatile xdata *)0xfe85)
#define I2CTXD (*(unsigned char volatile xdata *)0xfe86)
#define I2CRXD (*(unsigned char volatile xdata *)0xfe87)
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;