"PIC MCU LCD1602 displays a single a-word program
STATUS EQU 3H ; Define status register address
PORTA EQU 5H ; Define RA port data register address
PORTC EQU 7H ; Define RC port data register ground
PORTD EQU 8H ; Define Rd port data register address
TRISA EQU 85H ; Define the address of RA port direction control register
TRISC EQU 87H ; Define the address of RC port direction control register
TRISD EQU 88H ; Define the address of RD port direction control register
ADCON1 EQU 9FH ; Defines the address of ADC module control register 1
;********************
Z EQU 2 ; Defines the bit address of the 0 status bit
RP0 EQU 5 ; Defines the bit address of page selection bit RP0
;*********************
RS EQU 2 ; The LCD register selection signal pin is defined in rd.2 pin
RW EQU 1 ; LCD read / write signal pin is defined in rd.1 pin
E EQU 0 ; LCD chip selection signal pin is defined in rd.0 pin
;**********************
ORG 000H
NOP ; Place an empty operation instruction required by ICD
GOTO MAIN
ORG 0008H
MAIN
BSF STATUS，RP0
MOV LW 07H
MOV WF ADCON1 ; Set all RA ports as ordinary digital IO ports
MOV LW 00H ; Define RA port, RC port and RD port as output
MOV WF TRISC
MOV WF TRISD
BCF STATUS，RP0
CALL DELAY ; When calling, LCD reset may not be as fast as pic just after power on
MOV LW 01H
MOV WF PORTC ; Clear screen
CALL ENABLE
MOV LW 38H
MOV WF PORTC ; 8-bit 2-line 5x7 dot matrix
CALL ENABLE
MOV LW 0FH
MOV WF PORTC ; Display on, cursor on, flashing on
CALL ENABLE
MOV LW 06H
MOV WF PORTC ; When the text does not move, the cursor automatically moves to the right
CALL ENABLE
MOV LW 0C0H
MOV WF PORTC ; Write display start address (first position on the first line)
CALL ENABLE
MOV LW 41H
MOV WF PORTC ; Code for letter "a"
BSF PORTD，RS
BCF PORTD，RW
BCF PORTD，E
CALL DELAY
BSF PORTD，E
GOTO $
ENABLE
BCF PORTD，RS ; Subroutine for writing control command
BCF PORTD，RW
BCF PORTD，E
CALL DELAY
BSF PORTD，E
RETLW 0
;********************************************
DELAY
; The subroutine name is also the subroutine entry address
MOV lw 0ffh ; Pass the outer loop parameter value FFH through W
MOV wf 20h ; Feed 20h unit as external circulation variable
lp0 MOV lw 0ffh ; Pass the inner loop parameter value FFH through W
MOV wf 21h ; Feed 21h unit used as internal circulation variable
lp1 nop
decfsz 21h，1 ; The content of variable 21h decreases. If it is 0, skip
goto lp1 ; Jump to Lp1
decfsz 20h，1 ; The content of variable 20h decreases. If it is 0, skip
goto lp0 ; Jump to lp0
return ; Return to main program
end ; At the end of the source program, read the full text and the technical zone
Driving design of led by serial port of 51 single chip microcomputer
PIC MCU realizes LCD1602 to display letter A
Serial port connection with Proteus in 51 single chip microcomputer
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