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IR WR IR RD DR_WR EQU OFFCIH EQU OFFC3H : Define LCD status read port address EQU OFFCSH : Define LCD data write port : Define LCD command write port address CODE SEGMENT ASSUME CS:CODE, DS:CODE ORG Oh Setting CS Ds ;Code segment-Data Segment : AH-1 clear LCD Display : Output control code to LCD MOV AH.84H : Setup LCD DDRAM address-04h :Output control code to LCD : AH O ASCH ; output character to LCD at 04h START: MOV AX.CS MOV DS,AX MOV AH,1 CALL IRWR CALL IRWR MOV AH,O CALL OUTL. MOV AH,H CALL OUTL MOV AH," CALL OUTL MOV AH, CALL OUTL HLT ;Output command : Wait until LCD not BUSY MOV DX,IR_WR ; Enable LCD command write port address Character cony to Al IRWR: CALL BUSY MOY AL AH

IR WR IR RD DR_WR EQU OFFCIH EQU OFFC3H : Define LCD status read port address EQU OFFCSH : Define LCD data write port : Define LCD command write port address CODE SEGMENT ASSUME CS:CODE, DS:CODE ORG Oh Setting CS Ds ;Code segment-Data Segment : AH-1 clear LCD Display : Output control code to LCD MOV AH.84H : Setup LCD DDRAM address-04h :Output control code to LCD : AH O ASCH ; output character to LCD at 04h START: MOV AX.CS MOV DS,AX MOV AH,1 CALL IRWR CALL IRWR MOV AH,O CALL OUTL. MOV AH,H CALL OUTL MOV AH," CALL OUTL MOV AH, CALL OUTL HLT ;Output command : Wait until LCD not BUSY MOV DX,IR_WR ; Enable LCD command write port address Character cony to Al IRWR: CALL BUSY MOY AL AH

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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IR WR EQU OFFCIH IR RD DR_WR EQU OFFC3H EQU OFFCSH Define LCD command write port address ; Define LCD stattus read port address : Define LCD data write port CODE SEGMENT ASSUME CS:COODE, DS.CODE ORG Oh Setting CS-Ds ;Code segment-Data Segment : AH-1 clear LCD Display :Output control code to LCD ; Setup LCD DDRAM address-04h :Output control code to LCD : AH O ASCH ; output character to LCD at 04h START: MOV AX.CS MOV DS,AX MOV AH,1 CALL IRWR MOV AH.84H CALL IRWR MOV AH,O CALL OUTL. MOV AH.H CALL OUTL MOV AH,- CALL OUTL MOV AH, CALL OUTL HLT ;Output command IRWR: CALL BUSY : Wait until LCD not BUSY MOV DX,IR_WR ; Enable LCD command write port address MOV AL, AH OUT DX,AL RET ;Character copy to AL ; write command ; Output data character CALL BUSY MOV AL,AH ; Wait until LCD not BUSY OUTL: MOV DX,DR_WR; Enable LCD data write port address OUT DX,AL :Output data RET ; read LCD BUSY Status BUSY: BUSYI: MOV DX,IR_RD ; Enable LCD status read port address IN AL.DX AND AL,80H JNZ BUSYI : Read LCD status ; If BUSY, jump to BUSY1 ; If not busy, retum to upper routine RET CODE ENDS END START
Transcribed Image Text:IR WR EQU OFFCIH IR RD DR_WR EQU OFFC3H EQU OFFCSH Define LCD command write port address ; Define LCD stattus read port address : Define LCD data write port CODE SEGMENT ASSUME CS:COODE, DS.CODE ORG Oh Setting CS-Ds ;Code segment-Data Segment : AH-1 clear LCD Display :Output control code to LCD ; Setup LCD DDRAM address-04h :Output control code to LCD : AH O ASCH ; output character to LCD at 04h START: MOV AX.CS MOV DS,AX MOV AH,1 CALL IRWR MOV AH.84H CALL IRWR MOV AH,O CALL OUTL. MOV AH.H CALL OUTL MOV AH,- CALL OUTL MOV AH, CALL OUTL HLT ;Output command IRWR: CALL BUSY : Wait until LCD not BUSY MOV DX,IR_WR ; Enable LCD command write port address MOV AL, AH OUT DX,AL RET ;Character copy to AL ; write command ; Output data character CALL BUSY MOV AL,AH ; Wait until LCD not BUSY OUTL: MOV DX,DR_WR; Enable LCD data write port address OUT DX,AL :Output data RET ; read LCD BUSY Status BUSY: BUSYI: MOV DX,IR_RD ; Enable LCD status read port address IN AL.DX AND AL,80H JNZ BUSYI : Read LCD status ; If BUSY, jump to BUSY1 ; If not busy, retum to upper routine RET CODE ENDS END START
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