#include <msp430g2553.h>
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P1DIR |= 0x01; // P1.0 output
CCTL0 = CCIE; // CCR0 interrupt enabled
CCR0 = 50000;
TACTL = TASSEL_2 + MC_2; // SMCLK, contmode
_BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt
}
// Timer A0 interrupt service routine
#pragma vector=TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
{
P1OUT ^= 0x01; // Toggle P1.0
CCR0 += 50000; // Add Offset to CCR0
}
#include <msp430g2553.h>voidmain(void){ WDTCTL = WDTPW + WDTHOLD; // Stop WDT P1DIR |= 0x01; // P1.0 output CCTL0 = CCIE; // CCR0 interrupt enabled CCR0 = 50000; TACTL = TASSEL_2 + MC_2; // SMCLK, contmode _BIS_SR(LPM0_bits + GIE); // Enter LPM0 w/ interrupt}// Timer A0 interrupt service routine#pragma vector=TIMER0_A0_VECTOR__interrupt voidTimer_A (void){ P1OUT ^= 0x01; // Toggle P1.0 CCR0 += 50000; // Add Offset to CCR0} |
使用430G2553开发板，定时器采用连续计数模式，计数50000个时钟周期，产生中断，中断服务程序中中翻转P1.0电平，
测了一下p1.0输出波形，怎么是这样的？和预期不太一样，感觉应该是一个脉冲宽度为50000个时钟周期的方波，求解答。
而且SMCLK的频率为多少呢，手册没找到