R8CSLASH2G datasheet(112/344 Pages) RENESAS

112 / 344 page

R8C/2G Group

11. Clock Generation Circuit

Rev.1.00

Apr 04, 2008

Page 92 of 318

REJ09B0387-0100

Figure 11.5

Registers HRA0, HRA1, and HRA2

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

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 on)

• 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)

—

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

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

High-Speed On-Chip Oscillator Control Register 1(1)

Symbol

Address

After Reset

HRA1

0021h

When Shipping

NOTES:

Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the HRA1 register.

Function

The frequency of the high-speed on-chip oscillator is adjusted w ith bits 0 to 7.(2)

High-speed on-chip oscillator frequency = 8 MHz

(HRA1 register = value w hen shipping; fOCO-fast mode 0)

Setting the HRA1 register to a low er value results in a higher frequency.

Setting the HRA1 register to a higher value results in a low er frequency.

When changing the values of the HRA1 register, adjust these bits not to exceed the maximum value of the system

clock.

b7 b6 b5 b4 b3 b2 b1 b0

High-Speed On-Chip Oscillator Control Register 2(1)

Symbol

Address

After Reset

HRA2

0022h

00h

Bit Symbol

Bit Name

Function

NOTES:

3. Set this bit not to exceed the maximum value of the system clock.

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the HRA2 register.

Sw itching fOCO-fast mode 0 to fOCO-fast mode 2 multiplies the frequency by 0.5.

—

(b7-b5)

—

b7 b6 b5 b4 b3 b2 b1 b0

HRA21

—

(b0)

High-speed on-chip oscillator

mode select bit(3)

0: fOCO-fast mode 0

(8 MHz w hen the HRA1 register is set to

the value w hen shipping )

1: fOCO-fast mode 2(2)

Reserved bit

Set to 0.

—

(b4-b2)

Reserved bits

Set to 0.

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