VTech Alphabert s Magic Readport User Manual download pdf (Page 50)

Lab Manual of Microcontroller & Interfacing Page 50

ORG 1BH

RETI

ORG 23H

RETI

START:

MOV SP,#60H

MOV P1,#00H ;Set P1 as an output port

MOV P3,#00h ;Set P3 as an output port

MOV A,#38H ;Initialize LCD, 2 lines, 5X7 matrix

ACALL COMMAND ;Issue command to the LCD

MOV A,#0EH

ACALL COMMAND ;LCD ON, Cursor ON

MOV A,#01H

ACALL COMMAND ;Clear LCD

MOV A,#06H

ACALL COMMAND ;Shift cursor right

MOV A,#80H

ACALL COMMAND ;Force cursor at begining of the first line

MOV DPTR,#MSG ;Point to message "Freq:"

ACALL DISP_MSG ;Display message on first line

MOV TCON,#00H ;Timer 0 & Timer 1 off, flags in reset condition

MOV TMOD,#15H ;Timer 1 as a timer in mode 2 &

;Timer 0 as a counter in mode 1.

LOOP: MOV TL1,#0E0H ;Load Timer 1 with 45535(B1E0h)

MOV TH1,#0B1H ;results in 0.01 second delay)

MOV TL0,#00H ;Reset counter for counting operation

MOV TH0,#00H

MOV A,#088H ;Move cursor to line 2, position 8

ACALL COMMAND

MOV R1,#00H ;Clear R1 for overflow counting

MOV TCON,#50H ;Start timer 0 and timer 1

CHECK: JNB TF1,CHECK

CLR TF1

MOV TL1,#0E0H ;Load Timer 1 with 45536(b1e0h) results

;in 0.01 SECOND DELAY)

MOV TH1,#0B1H

SETB TR1

INC R1

CJNE R1,#64H,CHECK ;Count 100 interrupts to provide delay

;100X0.01 =1second

READ_FREQ:

CLR TR0 ;Stop timer 0

CLR TR1 ;Stop timer 1

MOV 30H,TL0 ;Transfer LSB of 16 bit count value at RAM

;location30h

MOV 31H,TH0 ;Transfer MSB of 16 bit count value at RAM

;location 31h

ACALL HEXBCD ;Convert hex number into binary numbers

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 79 80

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VTech Alphabert s Magic Readport User Manual Page 50

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