基于PIC单片机的128*64(ST7920)的液晶PIC程序

更新时间: 2019-03-23

阅读量：2431

十年专注单片机方案开发的方案公司英锐恩，分享基于PIC单片机的128*64(ST7920)的液晶PIC程序。英锐恩现提供服务产品涉及主控芯片：8位单片机、16位单片机、32位单片机及各类运算放大器等。

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;真实的表中的序号
endc

#define CS PORTA,0   ;又名RS脚.
#define SID PORTA,1 ;又名R/W脚.
#define SCLK PORTA,2 ;又名E脚.
;**********************************************************************
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
;写指令前，先对START赋值0XF8，写数据前先对START赋值0XFA
pagesel INILCM
CALL INILCM
MOVLW 0XF8
banksel START
MOVWF START

MOVLW 0X80;设定DDRAM位址到位址计数器。
banksel COM
MOVWF COM
pagesel WRITE
CALL WRITE

MOVLW 0XFA
banksel START
MOVWF START

;*********************************用户程序
     ;显示全部文字：
movlw 0X00;从第0个数开始取数。
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)