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| 3069RF-ZTAT Datasheet, PDF (716/1003 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER | |||
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19.5.3 Usage Notes
The DIVCR setting changes the Ï frequency, so note the following points.
⢠Select a frequency division ratio that stays within the assured operation range specified for the
clock cycle time tcyc in the AC electrical characteristics. Note that Ïmin = lower limit of the
operating frequency range. Ensure that Ï is not below this lower limit.
⢠All on-chip module operations are based on Ï. 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 20.4.3, Selection of Waiting Time for
Exit from Software Standby Mode.
Rev. 5.0, 09/04, page 694 of 978
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