R5F21183SP datasheet(73/257 Pages) RENESAS

73 / 257 page

R8C/18 Group, R8C/19 Group

10. Clock Generation Circuit

Rev.1.30

Apr 14, 2006

Page 58 of 233

REJ09B0222-0130

Figure 10.5

HRA0 Register

High-Speed On-Chip Oscillator Control Register 0

(1)

Symbol

Address

After Reset

HRA0

0020h

00h

Bit Symbol

Bit Name

Function

NOTES:

b7 b6 b5 b4 b3 b2 b1 b0

0000 00

HRA00

HRA01

High-speed on-chip oscillator enable

bit

0 : High-speed on-chip oscillator off

1 : High-speed on-chip oscillator on

High-speed on-chip oscillator select

bit(2)

0 : Selects low -speed on-chip oscillator.(3)

1 : Selects high-speed on-chip oscillator.

Change the HRA01 bit under the follow ing conditions.

• HRA00 = 1 (high-speed on-chip oscillation)

• The CM14 bit in the CM1 register = 0 (low -speed on-chip oscillator on)

When setting the HRA01 bit to 0 (low -speed on-chip oscillator selected), do not set the HRA00 bit to 0 (high-speed

on-chip oscillator off) at the same time.

Set the HRA00 bit to 0 after setting the HRA01 bit to 0.

—

(b7-b2)

Reserved bits

Set to 0.

Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the HRA0 register.

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