Serial Communication RS232 UART with Mode 1 Timer 1

/*******************************************************
* Copyright (c) 2004 Atmel.
* This file is an example to use uart with timer1.
* UART will echo a received data.
* This file can be parsed by Doxygen for automatic documentation
* generation.
* Put here the functional description of this file within the software
* architecture of your program.
********************************************************/
/* I N C L U D E S */
#include "8051.h"
char uart_data;
/********************************************************
* FUNCTION_PURPOSE: This file set up uart in mode 1 (8 bits uart) with
* timer 1 in mode 2 (8 bits auto reload timer).
* FUNCTION_INPUTS: void
* FUNCTION_OUTPUTS: void
********************************************************/
void main (void)

SCON = 0x50        ;/* uart in mode 1 (8 bit), REN=1 */
TMOD = TMOD | 0x20 ; /* Timer 1 in mode 2 */
TH1 = 0xFD         ; /* 9600 Bds at 11.059MHz */
TL1 = 0xFD         ; /* 9600 Bds at 11.059MHz */
ES = 1             ; /* Enable serial interrupt*/
EA = 1             ; /* Enable global interrupt */
TR1 = 1            ; /* Timer 1 run */
while(1)           ; /* endless */

/*******************************************************
* FUNCTION_PURPOSE: serial interrupt, echo received data.
* FUNCTION_INPUTS: P3.0(RXD) serial input
* FUNCTION_OUTPUTS: P3.1(TXD) serial output
*******************************************************/
void serial_IT(void) interrupt 4

if (RI == 1)
{        /* if reception occur */
RI = 0; /* clear reception flag for next reception */
uart_data = SBUF;/* Read receive data */
SBUF = uart_data;/* Send back same data on uart*/

else TI = 0      ;/* if emission occur */
}        /* clear emission flag for next emission*/Serial Communication RS232 UART with Mode 1 Timer 1/**************************************************
* Copyright (c) 2004 Atmel.
* This file is an example to use uart with timer2.
* UART will echo a received data.
* This file can be parsed by Doxygen for automatic documentation
* generation.
* Put here the functional description of this file within the software
* architecture of your program.
***************************************************/
/* @section I N C L U D E S */
#include "8051.h"
char uart_data;
/***************************************************
* FUNCTION_PURPOSE: This file set up uart in mode 1 (8 bits uart) with
* timer 2 in baud rate generator mode.
* FUNCTION_INPUTS: void
* FUNCTION_OUTPUTS: void
***************************************************/
void main (void)

SCON = 0x50     ; /* uart in mode 1 (8 bit), REN=1 */
T2CON &= 0xF0; /* EXEN2=0; TR2=0; C/T2#=0; CP/RL2#=0; */
T2CON |= 0x30  ; /* RCLK = 1; TCLK=1; */
TH2=0xFF          ; /* init value */
TL2=0xFD          ; /* init value */
RCAP2H=0xFF  ; /* reload value, 115200 Bds at 11.059MHz */
RCAP2L=0xFD  ; /* reload value, 115200 Bds at 11.059MHz */
ES = 1                 ; /* Enable serial interrupt */
EA = 1                ; /* Enable global interrupt */
TR2 = 1              ; /* Timer 2 run */
while(1)               ; /* endless */

/************************************************
* FUNCTION_PURPOSE: serial interrupt, echo received data.
* FUNCTION_INPUTS: P3.0(RXD) serial input
* FUNCTION_OUTPUTS: P3.1(TXD) serial output
*************************************************/
void serial_IT(void) interrupt 4

if (RI == 1)
{                              /* if reception occur */
RI = 0                   ; /* clear reception flag for next reception */
uart_data = SBUF; /* Read receive data */
SBUF = uart_data; /* Send back same data on uart*/

else TI = 0             ; /* if emission occur */
}                                /* clear emission flag for next emission*/