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msp430G2332的XT(5.5296Mhz)不起振

Other Parts Discussed in Thread: MSP430G2332

您好,我的msp430G2332的XT(5.5296Mhz)不起振是怎么回事?DCOCLK、VLOCLK都是好用的,我用的是20引脚的msp430G2332,我想用LFXT1外部晶振给系统提供时钟,,晶振电路上接了两个22P的电容。请教各位大侠,它怎么不起振呢?

另外,官方资料给出了一段汇编,第一句是  BIC    #OSCOFF,  SR      ;复位OSCOFF

这一句怎么用C实现呢?我加了一句__bis_SR_register(OSCOFF);不知道对不对,有这一句程序能够跑过等待晶振起振的语句,但晶振并没有起振,没有这一句,程序就停在了判断晶振起振的while上面。