R5F2L3ACBNFP datasheet(190/848 Pages) RENESAS

190 / 848 page

REJ09B0441-0010 Rev.0.10

Jul 30, 2008

Page 154 of 809

Under development Preliminary specification

Specifications in this manual are tentative and subject to change.

10. Power Control

R8C/L35A Group, R8C/L36A Group, R8C/L38A Group, R8C/L3AA Group,

R8C/L35B Group, R8C/L36B Group, R8C/L38B Group, R8C/L3AB Group

10.3.1

High-Speed Clock Mode

The XIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. When the CM14 bit is set to

0 (low-speed on-chip oscillator on) or the FRA00 bit in the FRA0 register is set to 1 (high-speed on-chip

oscillator on), fOCO can be used for timer RA.

Also, when the FRA00 bit is set to 1, fOCO40M can be used for timers RC, RD, and RG.

When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection

circuit.

10.3.2

Low-Speed Clock Mode

The XCIN clock divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock.

In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip

oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (flash memory low-consumption-current read

mode enabled).

Also, when the FRA00 bit is set to 1, fOCO40M can be used for timers RC, RD, and RG.

When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage detection

circuit.

To enter wait mode from low-speed clock mode, lower consumption current in wait mode is enabled by setting

the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled).

To reduce the power consumption, refer to 10.7 Reducing Power Consumption.

10.3.3

High-Speed On-Chip Oscillator Mode

The high-speed on-chip oscillator is used as the on-chip oscillator clock when the FRA00 bit in the FRA0

chip oscillator divided by 1 (no division), 2, 4, 8, or 16 is used as the CPU clock. When the FRA00 bit is set to

1, fOCO40M can be used for timers RC, RD, and RG.

Also, when the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage

detection circuit.

10.3.4

Low-Speed On-Chip Oscillator Mode

When the CM14 bit in the CM1 register is set to 0 (low-speed on-chip oscillator on) and the FRA01 bit in the

FRA0 register is set to 0, the low-speed on-chip oscillator is used as the on-chip oscillator clock. At this time,

the on-chip oscillator clock divided by 1 (no division), 2, 4, 8 or 16 is used as the CPU clock. The on-chip

oscillator clock is also the clock source for the peripheral function clocks. When the FRA00 bit is set to 1,

fOCO40M can be used for timers RC, RD, and RG.

Also, When the CM14 bit is set to 0 (low-speed on-chip oscillator on), fOCO-S can be used for the voltage

detection circuit.

In this mode, low consumption operation is enabled by stopping the XIN clock and the high-speed on-chip

oscillator, and by setting the FMR27 bit in the FMR2 register to 1 (flash memory low-consumption-current read

mode enabled).

To enter wait mode from low-speed clock mode, current consumption in wait mode can be further reduced by

setting the VCA20 bit in the VCA2 register to 1 (internal power low consumption enabled).

To reduce the power consumption, refer to 10.7 Reducing Power Consumption.

R5F2L3ACBNFP Datasheet(PDF) 190 Page - Renesas Technology Corp

R5F2L3ACBNFP Datasheet(HTML) 190 Page - Renesas Technology Corp

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