有22x4的,你可以参考一下,,具体到TI网上下载。
//******************************************************************************
// MSP430F22x4 Demo - Basic Clock, MCLK Sourced from HF XTAL
//
// Description: Proper selection of an external HF XTAL for MCLK is shown by
// first polling the OSC fault until XTAL is sta××e - only then is MCLK
// sourced by LFXT1. MCLK/10 is on P1.1 driven by a software loop taking
// exactly 10 CPU cycles.
// ACLK = MCLK = LFXT1 = HF XTAL, SMCLK = default DCO ~1.2MHz
// //* HF XTAL NOT INSTALLED ON FET *//
// //* Min Vcc required varies with MCLK frequency - refer to datasheet *//
//
// MSP430F22x4
// -----------------
// /|\| XIN|-
// | | | HF XTAL (3 ?16MHz crystal or resonator)
// --|RST XOUT|-
// | |
// | P1.1|-->MCLK/10 = HFXTAL/10
// | P2.0|-->ACLK = HFXTAL
//
// A. Dannenberg
// Texas Instruments Inc.
// April 2006
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x22x4.h"
volatile unsigned int i;
void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
P2DIR |= 0x01; // P2.0 = output direction
P2SEL |= 0x01; // P2.0 = ACLK function
P1DIR |= 0x02; // P1.1 = output direction
BCSCTL1 |= XTS; // ACLK = LFXT1 = HF XTAL
BCSCTL3 |= LFXT1S1; // 3 ?16MHz crystal or resonator
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)
for (;;) // Infinite loop
{
P1OUT |= 0x02; // P1.1 = 1
P1OUT &= ~0x02; // P1.1 = 0
}
}
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