VTech Alphabert s Magic Readport User Manual download pdf (Page 46)

Lab Manual of Microcontroller & Interfacing Page 46

/* 0x06 = 19,200 BPS 0x0C = 9,600 BPS 0x18 = 4,800 BPS */

/* 0x30 = 2,400 BPS */

outportb(PORT1 + 1 , 0x00); /* Set Baud rate - Divisor Latch High Byte

outportb(PORT1 + 3 , 0x03); /* 8 Bits, No Parity, 1 Stop Bit */

outportb(PORT1 + 2 , 0xC7); /* FIFO Control Register */

outportb(PORT1 + 4 , 0x0B); /* Turn on DTR, RTS, and OUT2 */

printf("\nSerial Communication with microcontroller. Press ESC to quit \n");

do { c = inportb(PORT1 + 5); /* Check to see if char has been received */

if (c & 1) {ch = inportb(PORT1); /* If so, then get Char */

printf("%c",ch);} /* Print Char to Screen */

if (kbhit()){ch = getch(); /* If key pressed, get Char */

outportb(PORT1, ch);} /* Send Char to Serial Port */

} while (ch !=27);

/* Quit when ESC (ASC 27) is pressed */

}

Program 4 : Receive and store data in RAM using interrupt

;Program to receive data through serial port of microcontroller at the

;baud rate 9600. Store data from the RAM location 20h

;This program uses interrupt method for reception of data

start: ORG 00h

AJMP start

ORG 23h ;Location for serial interrupt

ACALL store

RETI ;Return from the ISR

MOV P1,#0ffh ;Make P1 output port

MOV P2,#00h ;Make P2 output port

MOV TMOD,#20h ;Timer 1, mode-2 ( auto reload mode)

MOV TH1,#0FDh ;Count value for baud rate 9600

MOV SCON,#50h ;8 bit UART mode, REN enable

MOV IE,#90h ; Enable serial interrupt and EA bit

MOV R0,#20h ;Pointer to the RAM location

SETB TR1 ;Start timer 1 to generated baud rate.

next: MOV A, P1

MOV P2,A

SJMP next ;Repeat task

store: MOV A,SBUF

MOV @R0,A

INC R0

CLR RI

RET

END

Program 5: Receive and store data using polling (status checking)

;Program to receive data through serial port of microcontroller at the

;baud rate 9600. Store data from the RAM location 20h

;This program uses polling method.

ORG 00h

AJMP start

start: MOV TMOD,#20h ;Timer 1, mode-2 ( auto reload mode)

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VTech Alphabert s Magic Readport User Manual Page 46

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