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17.5.3
Usage Notes
The DIVCR setting changes the φ frequency, so note the following points.
• Select a frequency division ratio that stays within the assured operation range specified for the
clock cycle time t
operating frequency range. Ensure that ø is not below this lower limit.
• All on-chip module operations are based on φ. Note that the timing of timer operations, serial
communication, and other time-dependent processing differs before and after any change in the
division ratio. The waiting time for exit from software standby mode also changes when the
division ratio is changed. For details, see section 18.4.3, Selection of Waiting Time for Exit
from Software Standby Mode.
436
in the AC electrical characteristics. Note that ø
cyc
= lower limit of the
min
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