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发表于 2006-10-26 11:33:00
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Because there is a 16 bits length word to express the time/frequency. 8bit,32bit? too low or too high as ref source.
so the reason why it use 2E15 frequency is: it is easier for the timer of RTC block.
When a timer starts(such as beginning sleep), it settles the timer control word, and a counter starts which carry out counting down, when sleep ends(count to zero), there is waking up....
Above is my personal comprehension, with no insurance. [br]<p align=right><font color=red>+3 RD币</font></p> |
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