VTech Alphabert s Magic Readport User Manual download pdf (Page 53)

BM Dept., Govt. Engg. College, Gandhinagar Page 53

ACALL DELAY

MOV P1,A ;Get data for display

SETB P3.0 ;Select data register

CLR P3.2 ;Enable Write

SETB P3.1 ;Enable LCD (Strobe LCD)

CLR P3.1 ;Clear Enable and latch data

POP DPL

POP DPH

RET

DISP_MSG:

ACALL DELAY

CLR A

MOVC A,@A+DPTR

JZ EXIT

ACALL DISP_DATA

INC DPTR

SJMP DISP_MSG

EXIT: RET

DELAY: MOV R7,#22H

LOOP2: MOV R6,#0FFH

LOOP1: DJNZ R6,LOOP1

DJNZ R7,LOOP2

RET

MSG: DB 'FREQ:',0

END

Connect signal from the function generator to the input of opto-coupler and measure frequency

of the signal.

:: WORKSHEET ::

Exercise:

A. Simplify program to count external pulses given at T0 pin. Display this pulses on seven

segment display connected at port P0.

Memory

Location

HEX

code

Label Opcode Operands Comments

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 79 80

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VTech Alphabert s Magic Readport User Manual Page 53