Renesas M16C/26A Manual de usuario descargar pdf (Pagina 7)

M16C/2

Using the M16C/26 Timers in Timer Mod

REU05B0046-0100Z June 2003

Page 7 of 8

*=============================================================================

* $Log:$

*===========================================================================*/

#include "sfr26.h"

#define TIME_CONFIG 0x40 /* 01000000 value to load into timer mode register

||||||||_ TMOD0, TMOD1: TIMER MODE SELECTED

||||||____ MR0: NO PULSE OUTPUT

|||||_____ MR1, MR2: GATE FUNCTION NOT SELECTED

|||_______ MR3: SET TO 0 IN TIMER MODE

||________ TCK0, TCK1: F8 SELECTED */

#define CNTR_IPL 0x03 // TA0 priority interrupt level

#define LED p7_2 // LED4 is connected to p7_2 on the MSV30262 board

int time_cnt;

int count; //Global count value, incremented every second

//prototypes

void init(void);

#pragma INTERRUPT /B TimerA0Int

void TimerA0Int(void);

/*****************************************************************************

Name: TimerA0Int()

Parameters: none

Returns: nothing

Description: Timer A0 Interrupt Service Routine. Interrupts every 1ms,

toggles LED every second, and increments global'count'

**************************************************************************** */

void TimerA0Int(void)

{

if ((time_cnt++) > (1000)) // = 1 second

{ LED ^= 1; // toggle LED

count++; // example 1 second "clock"

time_cnt = 0;

}

/*****************************************************************************

Name: main()

Parameters: none

Returns: nothing

Description: initializes variables and LED port. Then does nothing but

wait for TA0 interrupts.

**************************************************************************** */

void main (void)

{

time_cnt = 0;

count = 0;

pd7_2 = 1;

init();

while (1); //LED flashing is interrupt driven

}

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