LCD1602显示全部字库字符

LCD1602显示全部字库字符、看门狗定时器测试

LCD1602液晶内含有192个字符字库，这个程序是分6屏进行显示，整个显示过程长约7秒，看门狗定时器设置时间为8.38秒，刚好显示完全部字符，修改看门狗就可以看到在显示中途重启，比较直观

LCD_E BIT P3.4 ;LCD片选

LCD_RS BIT P3.5 ;指令、数据位

LCD_RW BIT P3.6 ;读、写位

PORT EQU P0 ;端口定义

WDT_COUNT EQU 0E1H ;看门狗

START: LCALL LCD_INIT

LCALL WDT_INIT

MOV A,#01H ;清屏

LCALL WR_CMD

DISP_LOOP: MOV R0,#06H ;循环计数器

MOV R1,#80H ;LCD地址计数器

MOV R2,#00H ;字符表指针计数器

MOV DPTR,#TAB

WR_DAT_LOOP: MOV A,R1 ;地址命令

LCALL WR_CMD

INC R1 ;地址加一

MOV A,R2 ;表指针

MOVC A,@A+DPTR

LCALL WR_DA T

LCALL DELAY100MS

INC R2 ;表指针加一

CJNE R1,#90H,BIJIAO ;字符是否到16

MOV R1,#0C0H ;到16，换地址

BIJIAO: CJNE R1,#0D0H,WR_DAT_LOOP ;字符数是否到32

MOV R1,#80H ;地址回归

LCALL DELAY1S

MOV A,#1B ;清屏

LCALL WR_CMD

DJNZ R0,WR_DA T_LOOP

MOV WDT_COUNT,#00110111B

LJMP DISP_LOOP

LCD_INIT: MOV A,#111000B ;8位总线

LCALL WR_CMD

MOV A,#10B ;数据指针清零

LCALL WR_CMD

MOV A,#01H ;清屏

LCALL WR_CMD

MOV A,#1111B ;显示开，光标开，闪烁开

LCALL WR_CMD

MOV A,#10000000B ;设置显示地址00H

LCALL WR_CMD

RET

WDT_INIT: MOV WDT_COUNT,#00110111B ;看门狗定时器设置时间1.1秒RET

CHK_BUSY: SETB PORT.7

CLR LCD_RS

SETB LCD_RW

WAIT1: SETB LCD_E

MOV C,PORT.7

JC WAIT1

CLR LCD_E

RET

WR_CMD: LCALL CHK_BUSY

CLR LCD_RS

CLR LCD_RW

SETB LCD_E

MOV PORT,A

CLR LCD_E

RET

WR_DAT: LCALL CHK_BUSY

SETB LCD_RS

CLR LCD_RW

SETB LCD_E

MOV PORT,A

CLR LCD_E

RET

DELAY100MS: MOV R7,#10

DL5: MOV R6,#250

DL4: NOP

NOP

DJNZ R6,DL4

DJNZ R7,DL5

RET

DELAY1S: MOV R7,#10

DL1: MOV R6,#200

DL2: MOV R5,#248

DL3: DJNZ R5,DL3

DJNZ R6,DL2

DJNZ R7,DL1

RET

TAB: DB 20H,21H,22H,23H,24H,25H,26H,27H,28H,29H,2AH,2BH,2CH,2DH,2EH,2FH

DB

30H,31H,32H,33H,34H,35H,36H,37H,38H,39H,3AH,3BH,3CH,3DH,3EH,3FH

DB

40H,41H,42H,43H,44H,45H,46H,47H,48H,49H,4AH,4BH,4CH,4DH,4EH,4FH

DB

50H,51H,52H,53H,54H,55H,56H,57H,58H,59H,5AH,5BH,5CH,5DH,5EH,5FH

DB

60H,61H,62H,63H,64H,65H,66H,67H,68H,69H,6AH,6BH,6CH,6DH,6EH,6FH

DB

70H,71H,72H,73H,74H,75H,76H,77H,78H,79H,7AH,7BH,7CH,7DH,7EH,7FH

DB

0A0H,0A1H,0A2H,0A3H,0A4H,0A5H,0A6H,0A7H,0A8H,0A9H,0AAH,0ABH,0ACH,0ADH,0 AEH,0AFH

DB

0B0H,0B1H,0B2H,0B3H,0B4H,0B5H,0B6H,0B7H,0B8H,0B9H,0BAH,0BBH,0BCH,0BDH,0BE H,0BFH

DB

0C0H,0C1H,0C2H,0C3H,0C4H,0C5H,0C6H,0C7H,0C8H,0C9H,0CAH,0CBH,0CCH,0CDH,0CE H,0CFH

DB

0D0H,0D1H,0D2H,0D3H,0D4H,0D5H,0D6H,0D7H,0D8H,0D9H,0DAH,0DBH,0DCH,0DDH,0 DEH,0DFH

DB

0E0H,0E1H,0E2H,0E3H,0E4H,0E5H,0E6H,0E7H,0E8H,0E9H,0EAH,0EBH,0ECH,0EDH,0EEH ,0EFH

DB

0F0H,0F1H,0F2H,0F3H,0F4H,0F5H,0F6H,0F7H,0F8H,0F9H,0FAH,0FBH,0FCH,0FDH,0FEH,0 FFH

END