b02.asm

单片机实验程序-13种-17.4M-pdf.zip

;“模仿式”实验二     扩展时钟系统DS12887实验
;按“NEXT”键，调整秒位；按“LAST”键,调整分位;按"MON"键，调整时位;
;文件名：B02.ASM
OUTBIT   equ 0e101h  ; 位控制口
CLK164   equ 0e102h  ; 段控制口(接164时钟位)
DAT164   equ 0e102h  ; 段控制口(接164数据位)
IN       equ 0e103h  ; 键盘读入口

LEDBuf equ   60h     ; 显示缓冲

       ljmp  Start

LEDMAP:              ; 八段管显示码
       db    3fh, 06h, 5bh, 4fh, 66h, 6dh, 7dh, 07h
       db    7fh, 6fh, 77h, 7ch, 39h, 5eh, 79h, 71h
       db    00H

Delay:               ; 延时子程序
       mov   r7, #00
DelayLoop:
       djnz  r7, DelayLoop
       djnz  r6, Delay
       ret

DisplayLED:
       mov   r0, #LEDBuf
       mov   r1, #6          ; 共6个八段管
       mov   r2, #00000001b  ; 从左边开始显示
Loop:
       mov   dptr, #OUTBIT
       mov   a, #0
       movx  @dptr, a        ; 关所有八段管

       mov   a, @r0

       mov   B, #8           ; 送164
DLP:
       rlc   a
       mov   r3, a
       mov   acc.0, c

       mov   dptr, #DAT164
       anl a,#0fdh
       movx  @dptr, a
       mov   dptr, #CLK164
       orl a,#02h
       movx  @dptr, a
       anl a,#0fdh
       movx  @dptr, a
       mov   a, r3
       djnz  B, DLP
       mov   dptr, #OUTBIT
       mov   a, r2
       movx  @dptr, a        ; 显示一位八段管

       mov   r6, #1
       call  Delay

       mov   a, r2           ; 显示下一位
       rl    a
       mov   r2, a

       inc   r0

       djnz  r1, Loop

       ret

TestKey:
       mov   dptr, #OUTBIT
       mov   a, #0
       movx  @dptr, a        ; 输出线置为0
       mov   dptr, #IN
       movx  a, @dptr        ; 读入键状态
       cpl   a
       anl   a, #0fh         ; 高四位不用

       ret

KeyTable:                    ; 数字键码定义
       db    00h, 01h, 04h, 07h
       db    0fh, 02h, 05h, 08h
       db    0eh, 03h, 06h, 09h
       db    0dh, 0ch, 0bh, 0ah
       db    10H,11H,12H,13H,14H,
       db    15H,16H,10H,10H,10H

GetKey:
       mov   dptr, #OUTBIT
       mov   P2, dph
       mov   r0, #Low(IN)
       mov   r1, #00100000b
       mov   r2, #6
KLoop:
       mov   a, r1           ; 找出键所在列
       cpl   a
       movx  @dptr, a
       cpl   a
       rr    a
       mov   r1, a           ; 下一列

       movx  a, @r0
       cpl   a
       anl   a, #0fh
       jnz   Goon1           ; 该列有键入

       djnz  r2, KLoop

       mov   r2, #0ffh       ; 没有键按下, 返回 0ffh
       sjmp  Exit
Goon1:
       mov   r1, a           ; 键值 = 列 X 4 + 行

       mov   a, r2
       dec   a
       rl    a
       rl    a
       mov   r2, a           ; r2 = (r2-1)*4

       mov   a, r1           ; r1中为读入的行值
       mov   r1, #4
LoopC:
       rrc   a               ; 移位找出所在行
       jc    Exit
       inc   r2              ; r2 = r2+ 行值
       djnz  r1, LoopC
Exit:
       mov   a, r2           ; 取出键码

       mov   dptr, #KeyTable
       movc  a, @a+dptr
       mov   r2, a

WaitRelease:
       mov   dptr, #OUTBIT  ; 等键释放
       clr   a
       movx  @dptr, a

       mov   r6, #10
       call  Delay
       call  TestKey
       jnz   WaitRelease

       mov   a, r2
       ret

Start:
       mov r6,#02h
       call delay
       mov   20h,#00h
       mov   21h,#00h
       mov   22h,#00h
       mov   sp, #40h
       mov   dptr,#0e100h
       mov   a,#03h
       movx  @dptr,a
Start1:mov dptr,#0fe0ah
       movx a,@dptr
       anl a,#70h
       cjne a,#20h,start2 ;判断晶振打开否?
       sjmp start3
start2:
       mov dptr,#0fe0bh	  ;设置SET=0,芯片正常工作.24/12=1,选24小时制.
       mov a,#82h
       movx @dptr,a
       mov r0,#06h
       mov dptr,#0fe00h    ;;时分秒清零
       mov a,#00h
retun0:movx @dptr,a
       inc dptr
       djnz r0,retun0
       mov dptr,#0fe0ah
       mov a,#27h
       movx @dptr,a         ;打开晶振，ＳＱＷ输出５１２ＨＺ方波。
       inc dptr
       mov a,#5ah
       movx @dptr,a
start3:
       mov dptr,#0fe0ah
       movx a,@dptr
       jnb acc.7,loop12
       mov r5,#4dh
       djnz r5,$
loop12:mov dptr,#0fe0bh
       mov a,#5ah
       movx @dptr,a
loop13:mov dptr,#0fe00h	  ;读秒,分,时
       mov r1,#60h
       mov r0,#03h
loop11:movx a,@dptr
       lcall Ptreg		  ;读取的值,进行拆字后送显示缓冲器60H-65H
       inc dptr
       inc dptr
       djnz r0,loop11
       mov dptr,#0fe0bh
       call  DisplayLED       ; 调用显示子程序
       call  TestKey          ; 有键入?
       jz   loop12            ; 无键入, 继续显示
       call  GetKey           ; 有键入,读入键码
       cjne a,#14h,keep0
       sjmp keep1		   ;是NEXT键,调整秒位
keep0: cjne a,#15h,keep2
       sjmp keep3		   ;是LAST键,调整分位
keep2: cjne a,#16h,start1
       sjmp keep5  		   ;是MON键,调整时位
keep1: mov dptr,#0fe0bh
       mov a,#0dah
       movx @dptr,a
       mov  a,20h
       lcall Hbcd
       cjne a,#60h,loop20	   ;秒位不能超过60秒
       mov 20h,#00h
       sjmp loop13
loop20:mov dptr,#0fe00h
       movx @dptr,a
       inc 20h
       sjmp loop13
keep3: mov dptr,#0fe0bh
       mov a,#0dah
       movx @dptr,a
       mov  a,21h
       lcall Hbcd
       cjne a,#60h,loop21	  ;分位不能超过60分
       mov 21h,#00h
       sjmp loop13
loop21:mov dptr,#0fe02h
       movx @dptr,a
       inc 21h
       sjmp loop13


keep5: mov dptr,#0fe0bh
       mov a,#0dah
       movx @dptr,a
       mov  a,22h
       lcall Hbcd
       cjne a,#24h,loop22	     ;时位不能超过24小时
       mov 22h,#00h
       sjmp loop13
loop22:mov dptr,#0fe04h
       movx @dptr,a
       inc 22h
       sjmp loop13
Ptreg: push dph		     ;拆字子程序
       push dpl
       push a
       push b
       mov b,a
       anl a,#0fh
       mov dptr,#LEDMAP
       movc a,@a+dptr
       orl a,#80h
       mov @r1,a
       inc r1
       mov a,b
       swap a
       anl a,#0fh
       mov dptr,#LEDMAP
       movc a,@a+dptr
       mov @r1,a
       inc r1
       pop b
       pop a
       pop dpl
       pop dph
       ret
Hbcd:  mov b,#100		;单字节十六进制整数转换成单字节BCD码子程序
       div ab
       mov r3,a
       mov a,b
       mov b,#10
       div ab
       swap a
       orl a,b
       ret