我的24C02在写程序正常，但在读的时候，写入A1指令后24C02没有返回应答信号，请大家帮忙看看。
;--------------------------------------------------------------------
NOPP8:
CALL NOPP4
NOPP4:
NOP
NOP
NOP
NOP
RET
;--------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_START:
LD BTCON, #02H
OR P0, #18H ;SDA=1,SCL=1;
CALL NOPP8
AND P0, #0F7H ;SDA=0;
CALL NOPP8
AND P0, #0E7H ;SCL=0;SDA=0;
RET
;--------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_STOP:
AND P0, #0E7H
CALL NOPP8
OR P0, #10H
CALL NOPP8
OR P0, #18H
RET
;-------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_ERR:
OR ERROR_FLAG, #01H
JP T, EEPROM_STOP
;-------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
MASTER_ACK:
AND P0, #0E7H
CALL NOPP8
OR P0, #10H
CALL NOPP8
AND P0, #0E7H
RET
;---------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_ACK:
OR P0, #10H ;SCL=1;
CALL NOPP8
CLR R3
ACK_LOOP:
DEC R3
JR Z,EEPROM_ERR
CALL NOPP8
TM P0, #00001000B ;SDA=?
JR NZ, ACK_LOOP
AND P0, #0EFH ;SCL=0;
RET
;-------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
;
EEPROM_RD:
LD R0, #08H
CLR R1
AND P0, #0EFH ;SCL=0;
CALL NOPP8
OR P0,#08H ;SDA=1;
EEPROM_RD0:
CALL NOPP8
OR P0, #10H ;SCL=1;
CALL NOPP8
RCF
TM P0, #08H ;SDA=?
JR Z, EEPROM_RD1
SCF
EEPROM_RD1:
RLC R1
AND P0, #0EFH ;SCL=0;
DEC R0
JR NZ, EEPROM_RD0
AND P0, #0EFH ;SCL=0;
RET
;--------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_WR:
LD R0, #08H
EEPROM_WR0:
AND P0, #0E7H ;SCL=0,SDA=0;
CALL NOPP8
TM R1, #80H
JR Z, EEPROM_WR1
OR P0, #08H ;SDA=1;
EEPROM_WR1:
RL R1
CALL NOPP8
OR P0, #10H ;SCL=1;
CALL NOPP8
AND P0, #0EFH ;SCL=0;
NOP
DEC R0
JR NZ, EEPROM_WR0
;
RET
;--------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_RD_PAGE:
CALL EEPROM_START
LD R1,#0A0H
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK
LD R1,R2
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK
CALL EEPROM_START
LD R1,#0A1H
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK ;问题就在这里：24C02没有ACK信号。
EEPROM_RD_PAGE1:
CALL EEPROM_RD ;>> = R0 << R1.
LD EEPROM_DATA,R1
JP T, EEPROM_STOP
;--------------------------------------------------------------------
; P0.3--SDA P0.4--SCL
EEPROM_WR_PAGE:
CALL EEPROM_START
LD R1, #0A0H
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK
;
LD R1,EEPROM_ADDRESS
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK
EEPROM_WR_PAGE1:
LD R1,EEPROM_DATA
CALL EEPROM_WR ;>> R1 = R0 <<.
CALL EEPROM_ACK
JP T, EEPROM_STOP |
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