用单片机把数据写入24c02芯片里面，我这个程序到底出错在哪里？

SDA EQU P1.1
SCL EQU P1.0

ORG 0000H
AJMP MAIN
MAIN: MOV 47H,#32H
ACALL WR_24C02
WR_24C02:ACALL START
MOV A,#0A0H
NOP
NOP
NOP
ACALL SENTBYTE
NOP
NOP

MOV A,#00H
NOP
NOP
ACALL SENTBYTE
NOP
NOP
NOP
MOV A,47H
NOP
NOP
NOP
ACALL SENTBYTE
NOP
NOP
ACALL STOP
RET
SENTBYTE: MOV R0,#08H
SENT:RLC A
MOV SDA ,C
NOP
NOP
SETB SCL
NOP
NOP
NOP
CLR SCL
NOP
NOP
NOP
DJNZ R0 , SENT
NOP
NOP
SETB SDA
NOP
NOP
NOP
SETB SCL
NOP
NOP
REP: MOV C,SDA
JNC REP
NOP
CLR SCL
RET

START: SETB SDA
NOP
NOP
NOP
SETB SCL
NOP
NOP
NOP
CLR SDA
NOP
NOP
NOP
CLR SCL
RET

STOP: CLR SDA
NOP
NOP
SETB SCL
NOP
NOP
SETB SDA
NOP
NOP
CLR SCL
NOP
RET

END
求各位大侠帮忙看看吧！，这问题怎么解决？？？？