基于PIC單片機的128*64(ST7920)的液晶PIC程序

更新時間: 2019-03-23

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十年專注單片機方案開發的方案公司英銳恩，分享基于PIC單片機的128*64(ST7920)的液晶PIC程序。英銳恩現提供服務產品涉及主控芯片：8位單片機、16位單片機、32位單片機及各類運算放大器等。

list p=16F84A ; list directive to define processor
#include ; processor specific variable definitions

__CONFIG _CP_OFF & _WDT_OFF & _PWRTE_ON & _HS_OSC

; '__CONFIG' directive is used to embed configuration data within .asm file.
; The lables following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.
;***** VARIABLE DEFINITIONS

cblock 0X0c
w_temp
status_temp
TEMP1
TEMP2
TEMP3
TEMP4
TEMP5
START
COM
HDATA
LDATA
DATA8
DATACOUNT
index:2
indexback;真實的表中的序號
endc

#define CS PORTA,0   ;又名RS腳.
#define SID PORTA,1 ;又名R/W腳.
#define SCLK PORTA,2 ;又名E腳.
;**********************************************************************
ORG     0x000             ; processor reset vector
    goto    main              ; go to beginning of program

main
MOVLW 00H

banksel TRISA
MOVWF TRISA
banksel PORTA
MOVLW 00H
MOVWF PORTA
;寫指令前，先對START賦值0XF8，寫數據前先對START賦值0XFA
pagesel INILCM
CALL INILCM
MOVLW 0XF8
banksel START
MOVWF START

MOVLW 0X80;設定DDRAM位址到位址計數器。
banksel COM
MOVWF COM
pagesel WRITE
CALL WRITE

MOVLW 0XFA
banksel START
MOVWF START

;*********************************用戶程序
     ;顯示全部文字：
movlw 0X00;從第0個數開始取數。
banksel index
MOVWF indexback
DISPLAYLOOP:
   MOVLW 0X00
   MOVWF index+1
   MOVF indexback,0
   MOVWF index
   pagesel    LWORDTABLE
     call    LWORDTABLE
     banksel COM
     MOVWF COM
    pagesel WRITE
    CALL WRITE
    INCF indexback
   movf indexback,0
    ADDLW low(wordtablestart)
     XORLW low(wordtableend)