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M16C/5L Group, M16C/56 Group
9.3.1.4
125 kHz On-Chip Oscillator Mode
The fOCO-S clock divided by 1 (no division), 2, 4, 8 or 16 is used as the CPU clock. f1 with the same
frequency of the fOCO-S clock divided by 1 is used as the peripheral function clocks.
When fC is supplied, fC and fC32 can be used as the peripheral function clocks. fOCO-S can be
used as the peripheral function clocks. When fOCO40M and fOCO-F are supplied, they can be used
as the peripheral function clocks.
9.3.1.5
125 kHz On-Chip Oscillator Low Power Mode
The main clock and fOCO-F are turned off after the MCU enters 125 kHz on-chip oscillator mode.
The fOCO-S clock divided by 1 (no division), 2, 4, 8 or 16 is used as the CPU clock. f1 with the same
frequency of the fOCO-S clock divided by 1 is used as the peripheral function clocks.
When fC is supplied, fC and fC32 can be used as the peripheral function clocks. fOCO-S can be
used as the peripheral function clocks.
9.3.1.6
Low-Speed Mode
fC is used as the CPU clock.
When the CM21 bit is 0 and the CM11 bit is 0 (main clock), f1 with the same frequency of the main
clock divided by 1 is used as the peripheral function clocks. When the CM21 bit is 0 and the CM11 bit
is 1 (PLL clock), f1 with the same frequency of the PLL clock divided by 1 is used as the peripheral
function clocks.When the CM21 bit is 1 (on-chip oscillator clock) and the FRA01 bit is 0 (125 kHz on-
chip oscillator), f1 with the same frequency as the fOCO-S clock divided by 1 is used as the
peripheral function clocks. When the CM21 bit is 1 (on-chip oscillator clock) and the FRA01 bit is 1
(40 MHz on-chip oscillator), f1 with the same frequency as the fOCO-F clock divided by 1 is used as
the peripheral function clocks.
fC and fC32 can be used as the peripheral function clocks. When fOCO-S is supplied, it can be used
as the peripheral function clocks. When fOCO40M and fOCO-F are supplied, they can be used as
the peripheral function clocks.
9.3.1.7
Low Power Mode
The main clock and fOCO-F are stopped after the MCU enters low-speed mode. fC is used as the
CPU clock. When the CM21 bit is 1 (on-chip oscillator clock) and the FRA01 bit is 0 (125 kHz on-chip
oscillator clock), f1 with the same frequency as the fOCO-S clock divided by 1 is used as the
peripheral function clocks.
fC and fC32 can be used as the peripheral function clocks. When fOCO-S is supplied, it can be used
as the peripheral function clocks.
R01UH0127EJ0110 Rev.1.10
Sep 01, 2011
9. Power Control
Page 123 of 803
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