r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 155

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
10.6.11 Low-Current-Consumption Read Mode
In low-speed clock 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:
• 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.
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 division ratio of the CPU clock, set the FMR27 bit to 1.
When entering wait mode or stop mode, set the FMR27 bit to 0 (low-current-consumption read mode disabled)
before entering. Do not enter wait mode or stop mode while the FMR27 bit is 1.
Figure 10.7 shows the Procedure for Using Flash Memory Low-Current-Consumption Read Mode.
Preliminary document
Specifications in this document are tentative and subject to change.
10. Power Control
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