VTech Alphabert s Magic Readport User Manual download pdf (Page 40)

Lab Manual of Microcontroller & Interfacing Page 40

START: MOV TMOD,#20h ;Configure Timer 1 in mode 2 auto reload mode.

MOV TH1,#0fdh ;Load TH1 with FDh to achieve baud rate 9600

MOV SCON,#50h ;8 bit, 1 stop bit, REN Enabled.

MOV A,PCON ; Transfer content of PCON to accumulator

SETB ACC.7 ; Set bit 7 of accumulator

MOV PCON,A ; Set SMOD bit to 1 to double the baud rate

SETB TR1

NEXT: MOV SBUF,#’E’ ;Transfer alphabet ‘A’ to SBUF

HERE: JNB TI,HERE ;Wait for the last bit

CLR TI ;Clear TI for next ‘A’

SJMP NEXT

END

Modified program:

;Program to transmit text “YES” using Look up table in ROM through

;serial port of the microcontroller using 8 bit UART mode with baud rate

;19,200. TI flag is checked in this program to know whether transmission

;is over or not?

ORG 00H

AJMP START

START: MOV TMOD,#20h ;Configure Timer 1 in mode 2 auto reload mode.

MOV TH1,#0fdh ;Load TH1 with FDh to achieve baud rate 9600

MOV SCON,#50h ;8 bit, 1 stop bit, REN Enabled.

MOV A,PCON ; Transfer content of PCON to accumulator

SETB ACC.7 ; Set bit 7 of accumulator

MOV PCON,A ; Set SMOD bit to 1 to double the baud rate

SETB TR1

REPT: MOV DPTR,#0400h

NEXT: CLR A

MOVC A,@A+DPTR ; Get letter from look up table

JZ REPT

MOV SBUF,A ;Transfer letter from look up table

HERE: JNB TI,HERE ;Wait for the last bit

CLR TI ;Clear TI for next character

INC DPTR

SJMP NEXT

ORG 0400h

DB 'YES',0

EXIT: END

;Modified program for Serial transmission using interrupt method:

;Program to transmit data from RAM through serial port of

;the microcontroller using 8 bit UART mode with baud rate 9600

;Serial port interrupt is used for data transmission.

ORG 00h

AJMP start

ORG 23h ;Location for serial interrupt

ajmp serial

RETI ;Return from the ISR

start:

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VTech Alphabert s Magic Readport User Manual Page 40

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