关于定时器中断

chuzhitian

关于定时器中断 [复制链接]

2. #include "msp430g2553.h"

3. void delay(void); // Software delay

4. void main(void)

5. {
6. WDTCTL = WDTPW + WDTHOLD; // Stop WDT
7. ADC10CTL1 = CONSEQ_2; // Repeat single channel
8. ADC10CTL0 = REFOUT + REFON + MSC + ADC10ON;
9. __enable_interrupt(); // Enable interrupts.
10. TACCR0 = 30; // Delay to allow Ref to settle
11. TACCTL0 |= CCIE; // Compare-mode interrupt.
12. TACTL = TASSEL_2 | MC_1; // TACLK = SMCLK, Up mode.
13. LPM0; // Wait for delay.
14. TACCTL0 &= ~CCIE; // Disable timer Interrupt
15. __disable_interrupt();
16. ADC10AE0 |= 0x10; // P1.4 ADC option select
17. P1DIR |= 0x08; // Set P1.3 output direction
18. P1SEL |= 0x08; // Set P1.3 option select

19. for (;;)

20. {
21. ADC10CTL0 &= ~ENC; // ADC10 disable
22. ADC10CTL0 ^= REF2_5V; // Toggle Vref 1.5/2.5V
23. ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start
24. delay();
25. }
26. }

27. void delay(void)

28. {
29. volatile unsigned long i;
30. for (i = 0x7FFFF; i > 0; i--);
31. }

32. #pragma vector=TIMER0_A0_VECTOR

33. __interrupt void ta0_isr(void)
34. {
35. TACTL = 0;
36. LPM0_EXIT; // Exit LPM0 on return
37. }

复制代码

各位大神看下，上面中断中TACTL = 0有什么用？？为什么删掉也能运行？？

chuzhitian

自己先顶下！