Are there provisions in switching clock division ratio selection bit?
Latest Updated:08/05/2009
Question:
(CPU, Clock)
Are there any precautions about switching the clock division ratio selection bits? [2009/08/05]
Are there any precautions about switching the clock division ratio selection bits? [2009/08/05]
Answer:
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.
(#107430)
Suitable Products
3803H |
3803L |
3850A |
3858 |
38D2 |
38D5 |
7544 |
7545 |
7546 |
7547 |
7548 |
7549 |