Are there any precautions about switching the clock division ratio selection bits? [2009/08/05]
Please change the values of the clock division ratio selection bits at the same time using a single instruction.
Example using the 7546 Group:
When changing from on-chip oscillator (10) to middle-speed mode (01), if you switch the clock division ratio selection bits one at a time, you will transition through other states such as high-speed mode (00) or double-speed mode (11). Recommended operating voltage differs by frequency, so care is required.