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Chapter 3
Microcomputer Basics 1
III−42 8-bit timer operation
■ Example program
/************************************************************************/
/* CHECK Program for The count of the rising edge */
/* which used event count operation(8-bit) */
/************************************************************************/
/* Setting of Main Peripheral */
/* Port 0 : Unused */
/* Port 1 : Unused */
/* Port 2 : Unused */
/* Port 3 : Used as Timer 1 input */
/* Port 4 : Used as output port */
/* Port 5 : Unused */
/* Port 6 : Unused */
/* Port 7 : Unused */
/* Port 8 : Unused */
/* Timer 0 : Unused */
/* Timer 1 : Used as Event count operation */
/* Timer 2 : Unused */
/* Timer 3 : Unused */
/* Timer 8 : Unused */
/* Timer 11 : Unused */
/* 3-phase PWM output : Unused */
/* Serial interface communication 2 : Unused */
/* 10-bit A/D converters : Unused */
/* */
/* Interrupt : External interrupt Unused */
/* */
/* 2004/09 Rev 0.1 */
/************************************************************************/
#include "sr103s92.h"
#include "int.h"
/****************************/
/* Declaration of function */
/****************************/
void main(void);
void initialize(void);
/*-----------------------------------------------
After the assembler boot processing is completed
control is shifted to this main routine.
-----------------------------------------------*/
void main(void)
{
initialize(); /* Initial Job */
TM1MD = 0x00; /* Stop the counter */
/*-----------------------------------------------
P4 setting
-----------------------------------------------*/
P4OUT = 0x00; /* Set P44 Low(VSS level) */
P4DIR = 0x10; /* Set P44 output */
/*-----------------------------------------------
P3 setting
-----------------------------------------------*/
P3MD = 0x02; /* Set TM1IO port */
P3DIR = 0x00; /* Set P31 input */
/*-----------------------------------------------
Event count timer setting
-----------------------------------------------*/
TM1BR = 0x04; /* Set the base register */
TM1MD = TM1MD | 0x07; /* Select the clock source to TMIN1 pin input */
TM1MD = TM1MD | 0x40; /* Initial timer */
TM1MD = TM1MD & 0xBF; /* Set normal operation */
G4ICR = 0x0200; /* Set an interrupt level */
/* Enable the interrupt */
asm (" or 0x0F00,PSW\n"); /* Enable the interrupt, Interrupt level 7 */