m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 488

• 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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27.4 Clock Generation Circuit
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27.4.1 PLL Frequency Synthesizer
27.4.2 Power Consumption Control
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Stabilize supply voltage when using the PLL frequency synthesizer. The ripple of supply voltage at 5V
must be less than 10kHz in frequency, 0.5V (peak to peak) in voltage fluctuation range, and 1V/ms in
voltage fluctuation rate. The ripple of supply voltage at 3.3V must be less than 100Hz in frequency, 0.2V
(peak to peak) in voltage fluctuation range, and 0.1V/ms in voltage fluctuation rate.
• When resetting the microcomputer to exit stop mode, apply an "L" signal to the RESET pin until the main
• Write at least 4 NOP instructions after the WAIT instruction or instructions to set the CM10 bit in the CM1
• The followings are suggestions for reducing power consumption when programming or designing sys-
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1
clock oscillation stabilizes.
register to "1" (all clocks stop). When entering wait mode or stop mode, the instruction queue reads
ahead to instructions following the WAIT instruction and instructions to set the CM10 bit to "1", and the
program stops. The next instruction may be executed before entering wait mode or stop mode, depend-
ing on the combination of instructions and their execution timing.
tems:
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Ports: I/O ports maintains the same state despite the microcomputer entering wait mode or stop
mode. Current flows through active output ports. Feedthrough current flows through input ports in a
high-impedance state. Set unused ports as input ports and stablize electrical potential before entering
wait mode or stop mode.
A/D Converter: If the A/D conversion is not performed, set the VCUT bit in the AD0CON1 register to
"0"(no V
starting the A/D conversion.
D/A Converter: Set the DAi bit (i=0 to 1) in the DACON register to "0" (output disabled) and set the
DAi register to "00
Peripheral Function Stop: Set the CM02 bit in the CM0 register while in wait mode to stop unneces-
sary peripheral functions. However, this does not reduce power consumption because the peripheral
function clock (fc32) generating from the sub clock does not stop. When in low-speed mode and low-
power consumption mode, do not enter wait mode when the CM02 bit is set to "1" (peripheral clock
stops in wait mode).
External Clock: When an external clock is selected as the CPU clock, set the CM05 bit in the CM0
register to "1" (main clock stops). This disables the X
using an external clock input, the clock is applied regardless of the CM05 bit setting.)
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connection). Set the VCUT bit to "1" (V
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pin and reduces power consumption. (When
connection) and wait at least 1 s before
27. Precautions (Clock Generation Circuit)
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