2402.asm

eeprom的使用读写信息所需要的程序信号是24C02

wp equ p1.0
scl equ p1.1
sda equ p1.2
RELAY EQU P1.3
red equ p1.4
green equ p1.5
bell equ p1.6
key_open equ p1.7
addr equ 31h
data8 equ 32h
org 0
JMP READ_DATA
ORG 0030H
READ_DATA:mov sp,#6fh
;CLR BELL
;CLR RED
;CLR GREEN
;CLR RELAY
MOV ADDR,#00h
MOV DATA8,#0h

MOV A,#5

mov r7,#00h
READ_DATA1:clr wp
lcall del_10ms
LCALL WR_DATA
lcall del_10ms

MOV R6,A
INC ADDR
inc data8
DJNZ R7,READ_DATA1
lcall del_10ms
setb wp
    jmp $
wr_data:lcall bstart  ;写程序
;LCALL DELAY
         mov a,#0a0h
         ;LCALL DELAY
         lcall wbyte
         mov a,addr
         lcall wbyte
         ;LCALL DELAY


      ;clr wp
      lcall del_10ms
      mov a,data8
     lcall wbyte

     ;inc data8
     ;djnz r7,ff

    ;setb wp
     lcall bstop
     ret
rd_data:lcall bstart ;读程序
             mov a,#0a0h
             lcall wbyte
             mov a,addr
             lcall wbyte
             lcall delay
             lcall bstart
             mov a,#0a1h
             lcall wbyte
             lcall rbyte
             lcall bstop
             ret
delay:nop
NOP
NOP
NOP
NOP
NOP
NOP
ret
 bstart:clr scl ;启动条件
 lcall delay
 setb sda
 lcall delay
 setb scl

 clr sda
 lcall delay
 clr scl
 ret
 bstop:clr scl;停止条件
       lcall delay
       clr sda
       lcall delay
      setb scl
      lcall delay
       setb sda
       lcall delay
       clr scl
       lcall delay
       ret
wbyte:LCALL DELAY
        mov r2,#8   ;字节写程序
         ;clr wp
        lcall delay
        LCALL DELAY
        CLR C
wby0:clr scl
LCALL DELAY
      rlc a
    LCALL DELAY
    mov sda,c
    LCALL DELAY
     setb scl
       ;clr scl
       LCALL DELAY

       djnz r2,wby0
       LCALL DELAY
       ;lcall delay
       clr scl
       lcall delay
      setb scl
      lcall delay
      ;jnb sda,$
      ;LCALL DELAY
rep: mov c,sda
       Jc rep
        clr scl
       lcall delay
       ;setb wp
       ret
rbyte:lcall delay
       mov r2,#8
rby0:lcall delay
     setb scl
    lcall delay
    mov c,sda
    rlc a
    clr scl
    djnz r2,rby0
    clr scl
    lcall delay
     setb sda
     lcall delay
     setb scl
     lcall delay
     ret
wbyte1:LCALL DELAY
        mov r2,#8   ;字节写程序
         ;clr wp
        lcall delay
        CLR C
wby01:clr scl

      rlc a
    LCALL DELAY
    mov sda,c
    LCALL DELAY
     setb scl
       clr scl
       LCALL DELAY

       djnz r2,wby01
       LCALL DELAY
       ;lcall delay

       clr scl
       lcall delay
      setb scl
      LCALL DELAY
rep1: mov c,sda
       Jc rep1
        clr scl
       lcall delay
       ;setb wp
       ret
DELAY1:MOV R4,#0
DEL1:MOV R5,#100
DEL2:DJNZ R5,DEL2
     DJNZ R4,DEL1
     RET
del_10MS:MOV R4,#5
         LOOP1:MOV R3,#0F9H
         LOOP2:NOP
         NOP
         DJNZ R3,LOOP2
         DJNZ R4,LOOP1
         RET