test44x_ta_pwm01.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

//*******************************************************************************
//  MSP430TEST44X Demo - Timer_A PWM TA1-2 upmode, DCO SMCLK
//
//  Description; This program will generate a two PWM outputs on P1.2/2.0 using
//  Timer_A in an upmode.  The value in CCR0, 512, defines the period and the
//  values in CCR1 and CCR1 the duty PWM cycles.  Using 1.048MHz SMCLK as TACLK,
//  the timer period is 488us with a 75% duty cycle on P1.2 and 25% on P2.0.
//  ACLK = LFXT1 = 32768, MCLK = SMCLK = TACLK = DCO = 32xACLK = 1.048576Mhz
//  //*External watch crystal on XIN XOUT is required for ACLK*//	
//
//               MSP430F449
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//           |             P1.2|--> CCR1 - 75% PWM
//           |             P2.0|--> CCR2 - 25% PWM
//  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_A 的CCR0、CCR1和CCR2的比较模式功能
//            来实现周期是488uS,占空比分别为75%(P1.2)和25%(p2.0)的两路PWM输出。
//  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
  TACTL = TASSEL1 + TACLR;              // SMCLK, Clear Tar
  CCR0 = 512-1;                         // PWM Period = 488uS
  CCTL1 = OUTMOD_7;                     // CCR1 reset/set
  CCR1 = 384;                           // CCR1 PWM duty cycle
  CCTL2 = OUTMOD_7;                     // CCR2 reset/set
  CCR2 = 128;                           // CCR2 PWM duty cycle
  P1DIR |= 0x04;                        // P1.2 output
  P1SEL |= 0x04;                        // P1.2 TA1 otion
  P2DIR |= 0x01;                        // P2.0 output
  P2SEL |= 0x01;                        // P2.0 TA2 otion
  TACTL |= MC0;                         // Start Timer_A in up mode

  for (;;)
  {
    _BIS_SR(CPUOFF);                    // Enter LPM0
    _NOP();                             // Required only for C-spy
  }
}