R5F2L3ACBNFP datasheet(169/848 Pages) RENESAS

169 / 848 page

REJ09B0441-0010 Rev.0.10

Jul 30, 2008

Page 133 of 809

Under development Preliminary specification

Specifications in this manual are tentative and subject to change.

9. Clock Generation Circuit

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

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

9.2.6

High-Speed On-Chip Oscillator Control Register 0 (FRA0)

Notes:

1. Change the FRA01 bit under the following conditions.

• FRA00 = 1 (high-speed on-chip oscillator on)

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

• Bits FRA22 to FRA20 in the FRA2 register:

All division mode can be set when VCC = 3.0 V to 5.5 V

000b to 111b

Division ratio of 4 or more when VCC = 2.7 V to 5.5 V

010b to 111b (divide-by-4 or more)

Division ratio of 8 or more when VCC = 2.2 V to 5.5 V

110b to 111b (divide-by-8 or more)

2. When setting the FRA01 bit to 0 (low-speed on-chip oscillator selected), do not set the FRA00 bit to 0 (high-

speed on-chip oscillator off) at the same time. Set the FRA01 bit to 0 before setting the FRA00 bit to 0.

Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA0 register.

9.2.7

High-Speed On-Chip Oscillator Control Register 1 (FRA1)

Set the PRC0 bit in the PRCR register to 1 (write enabled) before rewriting the FRA1 register.

Address 0023h

Bit

b7b6b5

b4b3b2

b1b0

Symbol

—

FRA03

—

FRA01

FRA00

After Reset

000

Bit

Symbol

Bit Name

Function

R/W

FRA00

High-speed on-chip oscillator enable bit

0: High-speed on-chip oscillator off

1: High-speed on-chip oscillator on

R/W

FRA01

High-speed on-chip oscillator select bit (1) 0: Low-speed on-chip oscillator selected (2)

1: High-speed on-chip oscillator selected

R/W

—

Reserved bit

Set to 0.

R/W

FRA03

fOCO128 clock select bit

0: fOCO-S divided by 128 selected

1: fOCO-F divided by 128 selected

R/W

—

Reserved bits

Set to 0.

R/W

—

Address 0024h

Bit

b7b6b5

b4b3b2

b1b0

Symbol

——

———

After Reset When shipping

Bit

Function

R/W

b7-b0 The frequency of the high-speed on-chip oscillator can be changed by the following

settings.

40 MHz:

FRA1=FRA3=Value after a reset

36.864 MHz: Transfer the data of the FRA4 register to the FRA1 register, and transfer the

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