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Programmer and Target 89s51

Simple Mikrokontroller 89s51 Trainer


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Mode 13 bits Timer Software Gated (not used)

/**************************************************
* Copyright (c) 2004 Atmel.
* Please read file license.txt for copyright notice.
* @brief This file is an example to use timer0 in mode 0.
* 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"
/**************************************************
* FUNCTION_PURPOSE: This file set up timer 0 in mode 0 (13 bits timer)
* with a software gate.
* The 13-bits register consist of all 8 bits of TH0 and the lower 5 bits
* of TL0. The upper 3 bits of TL0 are undeterminate and are ignored.
* FUNCTION_INPUTS: void
* FUNCTION_OUTPUTS: void
***************************************************/
void main(void)
{
  TMOD &= 0xF0; /* Timer 0 mode 0 with software gate */
                              /* GATE0=0; C/T0#=0; M10=0; M00=0; */
  TH0 = 0x00;        /* init values */
  TL0 = 0x00;
  ET0=1;               /* enable timer0 interrupt */
  EA=1;                /* enable interrupts */
  TR0=1;              /* timer0 run */
  while(1);             /* endless */
}
/*************************************************
* FUNCTION_PURPOSE: timer0 interrupt
* FUNCTION_INPUTS: void
* FUNCTION_OUTPUTS: P1.0 toggle period = 2 * 8192 cycles
**************************************************/
void it_timer0(void) interrupt 1 /* interrupt address is 0x000b */
{
  TF0 = 0; /* reset interrupt flag (already done by hardware)*/
  P1_0 = ~ P1_0;/* P1.0 toggle when interrupt. */
}

Mode 13 bits Timer Hardware Gated

/**************************************************
* Copyright (c) 2004 Atmel.
* @brief This file is an example to use timer0 in mode 0.
*
* 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"
/**************************************************
* FUNCTION_PURPOSE: This file set up timer 0 in mode 0 (13 bits timer)
* with a hardware gate.
* The 13-bits register consist of all 8 bits of TH0 and the lower 5 bits
* of TL0. The upper 3 bits of TL0 are undeterminate and are ignored.
* FUNCTION_INPUTS: P3.2(INT0)=1 : GATE Input
* FUNCTION_OUTPUTS: void
***************************************************/
void main(void)
{
  TMOD &= 0xF0; /* Timer 0 mode 0 with hardware gate */
  TMOD |= 0x08; /* GATE0=1; C/T0#=0; M10=0; M00=0; */
  TH0 = 0x00; /* init values */
  TL0 = 0x00;
  ET0=1; /* enable timer0 interrupt */
  EA=1; /* enable interrupts */
  TR0=1; /* timer0 run */
  while(1); /* endless */
}
/**
* FUNCTION_PURPOSE: timer0 interrupt
* FUNCTION_INPUTS: void
* FUNCTION_OUTPUTS: P1.0 toggle period = 2 * 8192 cycles
*/
void it_timer0(void) interrupt 1 /* interrupt address is 0x000b */
{
  TF0 = 0; /* reset interrupt flag (already done by
  hardware)*/
  P1_0 = ~ P1_0;/* P1.0 toggle when interrupt. */
}

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