HD64F3687GHV Datasheet, PDF (107/566 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 5 Clock Pulse Generator
5.2.1 RC Control Register (RCCR)
RCCR controls the on-chip oscillator.
Bit
7
6
5
4 to 2
1
0
Initial
Bit Name Value R/W
RCSTP 0
R/W
FSEL
1
R/W
VCLSEL 0
R/W

All 0 
RCPSC1 1
R/W
RCPSC0 0
R/W
Description
On-Chip Oscillator Standby
The on-chip oscillator standby state is entered by setting
this bit to 1.
Frequency Select for On-chip Oscillator
0: 16 MHz
1: 20 MHz
Power Supply Select for On-chip Oscillator
0: Selects VBGR
1: Selects VCL
When the VCL power is selected, the accuracy of the on-
chip oscillator frequency cannot be guaranteed.
Reserved
These bits are always read as 0.
Division Ratio Select for On-chip Oscillator
The division ratio of R_OSC changes right after rewriting this
bit.
These bits can be written to only when the CKSTA bit in
CKCSR is 0.
0x: R (not divided)
OSC
10: R_OSC/2
11: R_OSC/4
Rev. 3.00 Sep. 10, 2007 Page 73 of 528
REJ09B0216-0300