test44x_ta01.c

ADC12操作 DATA FLASH操作 EEPROM操作 FLASH读写操作 LCD点阵操作 TIMER_A_操作 Timer_B操作 比较器A操作 端口操作 基

//******************************************************************************
//  MSP430-TEST44X Demo - Timer_A Toggle P5.1, CCR0 Contmode ISR, DCO SMCLK
//
//  Description; Toggle P5.1 using using software and TA_0 ISR. Toggle rate is
//  set at 50000 DCO/SMCLK cycles. Default DCO frequency used for TACLK.
//  Durring the TA_0 ISR P5.1 is toggled and 50000 clock cycles are added to
//  CCR0.  TA_0 ISR is triggered exactly 50000 cycles. CPU is normally off and
//  used only durring TA_ISR.
//  ACLK = n/a, MCLK = SMCLK = TACLK = DCO=1M  (led flash 50000/1M=50ms)
//
//           MSP430F449
//         ---------------
//     /|\|            XIN|-
//      | |               |
//      --|RST        XOUT|-
//        |               |
//        |           P5.1|-->LED
//
//  Lierda, Inc
//  February 2006.03
//  Built with IAR Embedded Workbench Version: 3.40A
//  ID：  MSP430-TEST44X
//  DATA：2005-7-12
//  REV： 2.0A
//  程序功能：该程序是用F449的内部TIMER_A CCR0的比较模式功能，来控制P5.1口驱动LED 30.5ms(1000/32.768)闪烁。
//  硬件连接：先连接P5.1口的短接器，然后连接键盘上方的短接器J2。
//
//******************************************************************************

#include <msp430x44x.h>

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  TACTL = TASSEL1 + TACLR;              // SMCLK, clear TAR
  CCTL0 = CCIE;                         // CCR0 interrupt enabled
  CCR0 = 50000;
  P5DIR |= 0x02;                        // P5.1 output
  TACTL |= MC1;                         // Start Timer_A in continuous mode
  _EINT();                              // Enable interrupts

  for (;;)
  {
    _BIS_SR(CPUOFF);                    // CPU off
    _NOP();                             // Required only for C-spy
  }
}

// Timer A0 interrupt service routine
//interrupt[TIMERA0_VECTOR] void Timer_A (void)
#pragma vector=TIMERA0_VECTOR
__interrupt void Timer_A (void)
{
  P5OUT ^= 0x02;                        // Toggle P5.1
  CCR0 += 50000;                        // Add Offset to CCR0
}