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关于G2433 TIMERA 时钟源ACLK的问题



使用G2433,主时钟是DCO 8M,我系统的进LPM3模式(只用ACLK活动),然后由timera中断唤醒。timera的时钟源只能选择ACLK。查看手册其中ACLK是这么介绍的ACLK: Auxiliary clock. ACLK is software selectable as LFXT1CLK or VLOCLK. ACLK is divided by 1,2, 4, or 8. ACLK is software selectable for individual peripheral modules.因为我没有外接晶振所以ACLK只能使用内部的VLOCLK。问题就来了手册上关于VLOVLK的介绍中又这么一句话:Devices without LFXT1 (for example, the MSP430G22x0) should be configured to use the VLO as ACLK,意思是G22X0系列ACLK的源只能是VLO。

1.那么G2433中哪个寄存器是配置选择ACLK的时钟源是LFXT1CLK还是vloclk,还是g2433默认的ACLK的源就是VLOCLK.

2.BCSSTL3中的LXT1SX配置成10就是把ACLK的源配制成VLOCLK?

3.不外接晶振。timera能否使用ACLK作为源