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DHT.asm
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DHT.asm
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JMP LABEL0
.ORG 003CH
JMP ISR75
.ORG 0050
MAIN: CALL LCD_INIT
CALL WELCOME
CALL DELAY_1 ; 1 sec delay
MVI A,C0H
SIM
CALL DELAY_20
MVI A,40H
SIM
CALL DELAY_20U
L1: RIM
ANI 80H
JZ L1
L2: RIM
ANI 80H
JNZ L2
LXI D,
MVI A,30H ; CONTROL WORD FOR 8254
OUT 03H ; PORT ADDRESS OF CONTROL REGISTER
MVI A,FFH ; LOW ORDER BYTE
OUT 00H
MVI A,FFH ; HIGH ORDER BYTE
OUT 00H
EI
MVI A,29H
L3: JNZ L3
DI
LABEL0: CALL LCD_INIT
MVI A,33H
CALL LCD_SEND
MVI A,37H
CALL LCD_SEND
HLT
DELAY_20: PUSH B
LXI B,681H
LOOP_20: DCX B
MOV A,B
ORA C
JNZ LOOP_20
POP B
RET
DELAY_20U: PUSH PSW
MVI A,01H
LOOP_20U: DCR A
JNZ LOOP_20U
POP PSW
RET
DELAY_1: PUSH B
PUSH D
MVI B,2E
Loop1: MVI C,6A
Loop2: MVI D,1C
Loop3: DCR D
JNZ Loop3
DCR C
JNZ Loop2
DCR B
JNZ Loop1
POP D
POP B
RET
DELAY: PUSH PSW
MVI A,0FH
LOOP: DCR A
JNZ LOOP
POP PSW
RET
LCD_INIT : MVI A,24H
OUT 01H
MVI A,20H
OUT 01H
CALL DELAY
MVI A,24H
OUT 01H
MVI A,20H
OUT 01H
CALL DELAY
MVI A,84H
OUT 01H
MVI A,80H
OUT 01H
CALL DELAY
MVI A,04H
OUT 01H
MVI A,00H
OUT 01H
CALL DELAY
MVI A,E4H
OUT 01H
MVI A,E0H
OUT 01H
CALL DELAY
MVI A,04H
OUT 01H
MVI A,00H
OUT 01H
CALL DELAY
MVI A,64H
OUT 01H
MVI A,60H
OUT 01H
LCD_SEND: PUSH PSW
PUSH B
PUSH D
MOV B,A
ANI F0H
MVI D,0CH
ORA D
OUT 01H
CALL DELAY
ANI F8
OUT 01H
MOV A,B
RLC
RLC
RLC
RLC
ANI F0H
MVI D,0CH
ORA D
OUT 01H
CALL DELAY
ANI F8H
OUT 01H
POP D
POP B
POP PSW
RET
ISR75: PUSH PSW
PUSH B
CPI 29H
JNZ
POP B
POP PSW
DCR A
EI
RET
ISR_HELP: MVI A,00H
OUT 03H
IN 00H
MOV C,A
IN 00H
MOV B,A
LCD_COMM: CALL DELAY
MVI A,5CH
OUT 01H
MVI A,58H
OUT 01H
CALL DELAY
MVI A,7CH
OUT 01H
MVI A,78H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,5CH
OUT 01H
MVI A,58H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,CCH
OUT 01H
MVI A,C8H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,3CH
OUT 01H
MVI A,38H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,FCH
OUT 01H
MVI A,F8H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,DCH
OUT 01H
MVI A,D8H
OUT 01H
CALL DELAY
MVI A,4CH
OUT 01H
MVI A,48H
OUT 01H
CALL DELAY
MVI A,5CH
OUT 01H
MVI A,58H
OUT 01H
CALL DELAY
MVI A,2CH
OUT 01H
MVI A,28H
OUT 01H
CALL DELAY
MVI A,1CH
OUT 01H
MVI A,18H
OUT 01H