VTech Alphabert s Magic Readport User Manual download pdf (Page 73)

BM Dept., Govt. Engg. College, Gandhinagar Page 73

SETB EOC ; MAKE EOC INPUT

CLR ALE

CLR OE CLR

START SETB

START ACALL

SDELAY CLR

START

HERE: JB EOC,HERE

HERE1: JNB EOC,HERE1

SETB OE

ACALL SDELAY

MOV A,P1

CPL A

MOV P0,A

CLR OE

AJMP BACK

DELAY: MOV R7,#02h

L3: MOV R6,#00h

L2: MOV R5,#00h

L1: DJNZ R5,L1

DJNZ R6,L2

DJNZ R7,L3

RET

SDELAY:

MOV R6,#00h

SL2: MOV R5,#00h

SL1: DJNZ R5,SL1

DJNZ R6,SL2

RET

END

Observations:

Input

Voltage

LED Status (ON/OFF) Hex

Value

D7 D6 D5 D4 D3 D2 D1 D0

0.5 V

1 V

2 V

2.5 V

3 V

4 V

5 V

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 79 80

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