test44x_tb03.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_B Toggle P5.1, overflow ISR, DCO SMCLK
//
//  Description; This program will toggle P5.1 using software and the timer_B
//  overflow ISR. In this example an ISR will trigger when TB overflows.
//  Inside the ISR P5.1 is toggled.  Toggle rate is 16hz using DCO frequency
//  of 1048576 with default FLL and watch crystal.	
//  ACLK = LFXT1 = 32768, MCLK = SMCLK = TBCLK = DCO = 32xACLK = 1.048576MHz
//  Proper use of TBIV interrupt vector generator demonstrated.
//  //*An external watch crystal on XIN XOUT is required for ACLK*//	
//
//           MSP430F449
//         ---------------
//     /|\|            XIN|-
//      | |               | 32kHz
//      --|RST        XOUT|-
//        |               |
//        |           P5.1|-->LED
//
//  zhangchong
//  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_B 的溢出中断功能，来控制P5.1口驱动LED 65.536ms（65536/1M）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
  FLL_CTL0 |= XCAP14PF;                 // Configure load caps
  TBCTL = TBSSEL0 + TBCLR + TBIE;       // aclk, clr. TBR, interrupt
  P5DIR |= 0x02;                        // Set P5.1 to output direction
  TBCTL |= MC1;                         // Start Timer_B in continous
  _EINT();                              // Enable interrupts

  for (;;)
  {
    _BIS_SR(CPUOFF);                    // CPU off
    _NOP();                             // Required only for C-spy
  }
}
#pragma vector=TIMERB1_VECTOR
__interrupt void Timer_B (void)
{
 switch( TBIV )
 {
   case  2: break;                      // CCR1 not used
   case  4: break;                      // CCR2 not used
   case 14: P5OUT ^= 0x02;              // overflow
            break;
 }
}