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H8/3028F Datasheet(PDF) 662 Page - Renesas Technology Corp |
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H8/3028F Datasheet(HTML) 662 Page - Renesas Technology Corp |
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662 / 923 page  Rev. 2.00, 09/03, page 632 of 890 19.5.3 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 tcyc in the AC electrical characteristics. Note that φmin = lower limit of the operating frequency range. Ensure that φ 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 20.4.3, Selection of Waiting Time for Exit from Software Standby Mode. |
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