Renesas R8C/18 Series Hardware Manual page 73

R8C/18 Group, R8C/19 Group
High-Speed On-Chip Oscillator Control Register 0
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0 0 0
NOTES:
1. Set the PRC0 bit in the PRCR register to 1 (w rite enable) before rew riting the HRA0 register.
2. 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)
3. 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.
Figure 10.5 HRA0 Register
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Symbol Address
0020h
HRA0
Bit Symbol Bit Name
High-speed on-chip oscillator enable
HRA00
bit
High-speed on-chip oscillator select
HRA01
(2)
bit
— Reserved bits
(b7-b2)
Page 58 of 233
(1)
0 : High-speed on-chip oscillator off
1 : High-speed on-chip oscillator on
0 : Selects low -speed on-chip oscillator.
1 : Selects high-speed on-chip oscillator.
Set to 0.
10. Clock Generation Circuit
After Reset
00h
Function
(3)
RW
RW
RW
RW