MS51
Nov. 28, 2019
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MS51
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3. Once user switches the system clock source to an enabled but still instable one, the hardware
will wait for stabilization of the target clock source and then switch to it in the background.
During this waiting period, the device will continue executing the program with the original
clock source and CKSWTF will be set as 1. After the stable flag of the target clock source (see
CKSWT[7:3]) is set and the clock source switches successfully, CKSWTF will be cleared as 0
automatically by hardware.