R28 datasheet(106/473 Pages) RENESAS

106 / 473 page

R8C/28 Group, R8C/29 Group

10. Clock Generation Circuit

Rev.2.10

Sep 26, 2008

Page 87 of 441

REJ09B0279-0210

10.5

Power Control

There are three power control modes. All modes other than wait mode and stop mode are referred to as standard

operating mode.

10.5.1

Standard Operating Mode

Standard operating mode is further separated into four modes.

In standard operating mode, the CPU clock and the peripheral function clock are supplied to operate the CPU

and the peripheral function clocks. Power consumption control is enabled by controlling the CPU clock

frequency. The higher the CPU clock frequency, the more processing power increases. The lower the CPU

clock frequency, the more power consumption decreases. When unnecessary oscillator circuits stop, power

consumption is further reduced.

Before the clock sources for the CPU clock can be switched over, the new clock source needs to be oscillating

and stable. If the new clock source is the XIN clock or XCIN clock, allow sufficient wait time in a program

until oscillation is stabilized before exiting.

−: can be 0 or 1, no change in outcome

NOTE:

1. For N, D version only.

Table 10.2

Settings and Modes of Clock Associated Bits

Modes

OCD

CM1 Register

CM0 Register

FRA0 Register

OCD2

CM17,

CM16

CM14

CM13

CM06

CM05

CM04

CM01 FRA01 FRA00

High-speed

clock mode

No division

00b

−

−−

Divide-by-2

01b

−

−−

Divide-by-4

10b

−

−−

Divide-by-8

−−

−

−−

Divide-by-16

11b

−

−−

Low-speed

clock

mode(1)

No division

00b

−−

−

−−

Divide-by-2

01b

−−

−

−−

Divide-by-4

10b

−−

−

−−

Divide-by-8

−−−

−

−−

Divide-by-16

11b

−−

−

−−

High-speed

on-chip

oscillator

mode

No division

00b

−−

−−−

Divide-by-2

01b

−−

−−−

Divide-by-4

10b

−−

−−−

Divide-by-8

−−−

Divide-by-16

11b

−−

−−−

Low-speed

on-chip

oscillator

mode

No division

00b

−

−−−

−

Divide-by-2

01b

−

−−−

−

Divide-by-4

10b

−

−−−

−

Divide-by-8

−

−−−

−

Divide-by-16

11b

−

−−−

−

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