r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 705

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
33.2.11 Low-Current-Consumption Read Mode
In low-speed clock mode and low-speed on-chip oscillator mode, the current consumption when reading the
flash memory can be reduced by setting the FMR27 bit in the FMR2 register to 1 (low-current-consumption
read mode enabled).
Low-current-consumption read mode can be used when the CPU clock is set to either of the following:
•
•
However, do not use low-current-consumption read mode when the frequency of the selected CPU clock is
3 kHz or below.
After setting the divide ratio of the CPU clock, set the FMR27 bit to 1 (low-current-consumption read mode
enabled).
Enter wait mode or stop mode after setting the FMR27 bit to 0 (low-current-consumption read mode disabled).
Do not enter wait mode or stop mode while the FMR27 bit is 1 (low-current-consumption read mode enabled).
Figure 33.4 shows the Handling Procedure Example of Low-Current-Consumption Read Mode.
The CPU clock is set to the low-speed on-chip oscillator clock divided by 4, 8, or 16.
The CPU clock is set to the XCIN clock divided by 1 (no division), 2, 4, or 8.
33. Reducing Power Consumption
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