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R8C/2G 数据表(PDF) 119 Page - Renesas Technology Corp |
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R8C/2G 数据表(HTML) 119 Page - Renesas Technology Corp |
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119 / 344 page  R8C/2G Group 11. Clock Generation Circuit Rev.1.00 Apr 04, 2008 Page 99 of 318 REJ09B0387-0100 11.4 Power Control There are three power control modes. All modes other than wait mode and stop mode are referred to as standard operating mode. 11.4.1 Standard Operating Mode Standard operating mode is further separated into three modes. In standard operating mode, the CPU clock and the peripheral function clock are supplied to operate the CPU and the peripheral function clocks. Power consumption control is enabled by controlling the CPU clock frequency. The higher the CPU clock frequency, the more processing power increases. The lower the CPU clock frequency, the more power consumption decreases. When unnecessary oscillator circuits stop, power consumption is further reduced. Before the clock sources for the CPU clock can be switched over, the new clock source needs to be oscillating and stable. If the new clock source is the XCIN clock, allow sufficient wait time in a program until oscillation is stabilized before exiting. −: Can be 0 or 1, no change in outcome Table 11.2 Settings and Modes of Clock Associated Bits Modes OCD Register CM1 Register CM0 Register HRA0 Register OCD2 CM17, CM16 CM14 CM06 CM04 HRA01 HRA00 High-speed on-chip oscillator mode No division 1 00b − 0 − 11 Divide-by-2 1 01b − 0 − 11 Divide-by-4 1 10b − 0 − 11 Divide-by-8 1 −− 1 − 11 Divide-by-16 1 11b − 0 − 11 Low-speed on-chip oscillator mode No division 1 00b 0 0 − 0 − Divide-by-2 1 01b 0 0 − 0 − Divide-by-4 1 10b 0 0 − 0 − Divide-by-8 1 − 01 − 0 − Divide-by-16 1 11b 0 0 − 0 − Low-speed clock mode No division 0 00b − 01 −− Divide-by-2 0 01b − 01 −− Divide-by-4 0 10b − 01 −− Divide-by-8 0 −− 11 −− Divide-by-16 0 11b − 01 −− |
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