Does subsystem clock multiplication work even when the main system clock is stopped?
Q1 In the uPD789488, it is now possible to specify x8 (x4) multiplication of the subsystem clock using the subsystem clock selection register. What kind of principle is involved in achieving x8 (x4) multiplication? (Is multiplication performed even when the main system clock is stopped?) A1 Since an explanation of the internal circuits of the device is complicated, it will be omitted here. Suffice to say that the main system clock is not used for multiplication, so multiplication is performed even when the main system clock is stopped.
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