Timer_0_mode_0_timer_gate_hard.zip_timer

/** * @file $RCSfile: t0_m0_t_gh.c,v $ * * Copyright (c) 2004 Atmel. * * Please read file license.txt for copyright notice. * * @brief This file is an example to use timer0 in mode 0. * * 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. * * @version $Revision: 1.0.0 $ $Name: $ */ /* @section I N C L U D E S */ #include "reg_c51.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 = 0xFF; 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. */ }