m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 104

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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8.5.1 Normal Operation Mode
1
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B
The normal operation mode is further separated into six modes.
In normal operation mode, the CPU clock and peripheral function clock are supplied to operate the CPU
and peripheral function. The power consumption control is enabled by controlling the CPU clock fre-
quency. The higher the CPU clock frequency, the more processing power increases. The lower the CPU
clock frequency, the more power consumption decreases. When unnecessary oscillation circuits stop,
power consumption is further reduced.
Switch the CPU clock after the clock to be switched to stabilizes. Sub clock oscillation will take longer
to stabilize. Wait, by program, until the clock stabilizes directly after running the microcomputer on or
exiting stop mode.
To switch the on-chip oscillator to the main clock, enter medium-speed mode (divide-by-8) after the main
clock is divided by eight in on-chip oscillator mode (MCD register=08
Do not enter on-chip oscillator mode or on-chip oscillator low-power consumption mode from low-speed
mode or low-power consumption mode and vice versa.
NOTES:
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8.5.1.1 High-Speed Mode
8.5.1.2 Medium-Speed Mode
8.5.1.3 Low-Speed Mode
8.5.1.4 Low-Power Consumption Mode
8.5.1.5 On-chip Oscillator Mode
8.5.1.6 On-chip Oscillator Low-Power Consumption Mode
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1. When the CM17 bit is set to "1" (PLL clock as CPU clock source), the PLL clock is the main clock .
2. Contact your oscillator manufacturer for oscillation stabilization time.
The main clock
When the sub clock runs, f
The main clock divided-by-2, -3, -4, -6, -8, -10, -12, -14, or -16 becomes the CPU clock. The main
clock is the clock source for the peripheral function clock. When the sub clock runs, f
as the count source for the timers A and B.
The sub clock becomes the CPU clock. The main clock is the count source for the peripheral function
clock. f
The microcomputer enters low-power consumption mode when the main clock stops in low-speed
mode. The sub clock becomes the CPU clock. f
B. Only f
register is set to "08
microcomputer is in middle-speed mode (divide-by-8 mode).
The on-chip oscillator clock divided-by-1(no division), -2, -3, -4, -6, -8, -10, -12, -14, or -16 becomes
the CPU clock. The on-chip oscillator clock is the clock source for the peripheral function clock. When
the sub clock runs, f
The microcomputer enters on-chip oscillator low-power consumption mode when the main clock stops
in on-chip oscillator mode. The on-chip oscillator clock divided-by-1(no division), -2, -3, -4, -6, -8, -10, -
12, -14, or -16 becomes the CPU clock. The on-chip oscillator clock is the clock source for the peripheral
function clock. When the sub clock runs, f
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C32
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C32
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can be used as the count source for the timers A and B.
2
can be used as the peripheral function clock. In low-power consumption mode, the MCD
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(1)
, 3
becomes the CPU clock and the clock source for the peripheral function clock.
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C32
16
3
2
" (divide-by-8 mode). Therefore, when the main clock resumes running, the
C
f o
can be used as the count source for the timers A and B.
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4
C32
3
8
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8
can be used as a count source for the timers A and B.
C32
can be used as the count source for the timers A and B.
C32
can be used as the count source for timers A and
16
).
8. Clock Generation Circuit
C32
can be used
(2)