[P]哥们，来个参考TI的，看看人家怎么设置吧[EM01][/P][P][CODE]
// MSP430F149
// -----------------
// /|\| XIN|-
// | | | HF XTAL (455k - 8MHz)
// --|RST XOUT|-
// | |
// | P4.1/TB1|--> CCR1 - 75% PWM
// | P4.2/TB2|--> CCR2 - 25% PWM
#include <msp430x14x.h>
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW +WDTHOLD; // Stop WDT
BCSCTL1 |= XTS; // ACLK= LFXT1 = HF XTAL
do
{
IFG1 &= ~OFIFG; // Clear OSCFault flag
for (i = 0xFF; i > 0; i--); // Time for flag to set
}
while ((IFG1 & OFIFG)); // OSCFault flag still set?
BCSCTL2 |= SELM_3; // MCLK= LFXT1 (safe)
P4DIR |= 0x06; // P4.1 and P4.2 output
P4SEL |= 0x06; // P4.2 and P4.2 TB1/2 otions
TBCCR0 = 128; // PWM Period/2
TBCCTL1 = OUTMOD_6; // CCR1 toggle/set
TBCCR1 = 32; // CCR1 PWM duty cycle
TBCCTL2 = OUTMOD_6; // CCR2 toggle/set
TBCCR2 = 96; // CCR2 PWM duty cycle
TBCTL = TBSSEL_1 + MC_3; // ACLK, up-down mode
_BIS_SR(CPUOFF); // Enter LPM0
}
[/CODE][/P][P]这种应用一早就该早参考啦...希望能帮助你吧。[/P]