[ATmeag88] Timer2 테스트 - 8-bit Timer/Counter2 with PWM
- Single Channel Counter
- Clear Timer on Compare Match (Auto Reload)
- Glitch-free, Phase Correct Pulse Width Modulator (PWM)
- Frequency Generator
- 10-bit Clock Prescaler
- Overflow and Compare Match Interrupt Sources (TOV2, OCF2A and OCF2B)
- Allows Clocking from External 32 kHz Watch Crystal Independent of the I/O Clock
Timer2 초기화
#define TIMER2_VALUE (256-115)
#define TIMER2_CLK_DIVCLK 1
#define TIMER2_CLK_DIV8 2
#define TIMER2_CLK_DIV32 3
#define TIMER2_CLK_DIV64 4
#define TIMER2_CLK_DIV128 5
#define TIMER2_CLK_DIV256 6
#define TIMER2_CLK_DIV1024 7
#define TIMER2_DISABLE_PWM 0
#define TIMSK TIMSK2
#define TIMER2_INT_ENABLE BIT0
#define Timer2Set(Value) (TCNT2 = Value)
#define TCCR2 TCCR2B
//Initialize Timer2
void IntitTime2(void)
{
// Enable Timer 2 output compare interrupt
Sbi(TIMSK, TIMER2_INT_ENABLE);
// Start timer 2 with prescaler 128
Sbi(TCCR2, TIMER2_CLK_DIV128);
//set 1ms
Timer2Set(TIMER2_VALUE);
}
Timer Interrupt Handler
SIGNAL(SIG_OUTPUT_COMPARE2A)
{
gTimeTick++;
Timer2Set(255-5);
}
