问一下msp430f417用低频32768有时不起振,可以外接有源32768晶振么?
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//******************************************************************************
// MSP-FET430P410 Demo - FLL+, Output MCLK, ACLK Using 32kHz XTAL and DCO
//
// Description: This program outputs buffered MCLK and ACLK on port pins
// P1.1 and P1.5.
// ACLK = LFXT1 = 32768Hz, MCLK = SMCLK = default DCO = 32 x ACLK = 1048576Hz
// //* An external watch crystal between XIN & XOUT is required for ACLK *//
//
// MSP430F413
// -----------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// | P1.1/MCLK|-->MCLK = 1048576Hz
// | P1.5/ACLK|-->ACLK = 32kHz
//
// M. Buccini
// Texas Instruments Inc.
// Feb 2005
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.21A
//*****************************************************************************
#include <msp430.h>
int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer
FLL_CTL0 = XCAP14PF; // Configure load caps
P1DIR = 0x22; // P1.1,5 to output direction
P1SEL = 0x22; // P1.1,5 to output MCLK & ACLK
while(1); // Loop in place
}
请试一下上面的代码,谢谢