请看“STR912FA的技术参考手册”的第2.5.4节(Sleep mode),有这么一段:This is the lowest power mode of MCU. In this mode, all clock circuits (except RTC) and the oscillator pin (4-25MHz) are turned off. In this mode, the CPU does not continue to execute any instructions. All peripherals except the RTC have their clocks stopped. The ARM Flash Memory is put in power down mode at the same time as the ARM MCU.
有下划线的那句话说得很明确,芯片内部会自动地关闭相应部分的时钟。请注意是“关闭外设的时钟”而不是“关闭外设”,这是两个不同的概念。
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