R8C16 datasheet(56/279 Pages) RENESAS

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R8C/16 Group, R8C/17 Group

9. Clock Generation Circuit

Rev.2.10

Jan 19, 2006

Page 43 of 254

REJ09B0169-0210

Figure 9.5

HRA0 Register

High-speed On-Chip Oscillator Control Register 0

(1)

Symbol

Address

After Reset

HRA0

0020h

00h

Bit Symbol

Bit Name

Function

NOTES :

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

b7 b6 b5 b4 b3 b2 b1 b0

000000

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” (selects low -speed on-chip oscillator), 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 Bit

Set to “0”

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