M16C65 Datasheet, PDF (449/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
20. Real-Time Clock
20.2.7 Real-Time Clock Count Source Select Register (RTCCSR)
Real-Time Clock Count Source Select Register
b7 b6 b5 b4 b3 b2 b1 b0
0
Symbol
RTCCSR
Address
0346h
After Reset
XXX0 0000b
Bit Symbol
Bit Name
Function
RW
RCS0
b1 b0
0 0 : f1
RW
Count source select bit
0 1 : Do not set
RCS1
1 0 : fC
1 1 : Do not set
RW
RCS2
b4 b3 b2
0 0 0 : f1 = fC or 4 MHz
RW
0 0 1 : f1 = 6 MHz
RCS3
Count source frequency select
bit
0
0
1
1
1
0
0 : f1 = 8 MHz
1 : f1 = 16 MHz
0 : f1 = 20 MHz
RW
1 0 1 : f1 = 24 MHz
RCS4
1 1 0 : f1 = 32 MHz
RW
1 1 1 : Do not set
—
(b6-b5)
No register bits. If necessary, set to 0. Read as undefined value
—
—
(b7)
Reserved bit
Set to 0
RW
When bits RCS1 to RCS0 are 10b (fC), set bits RCS4 to RCS2 to 000b.
When bits RCS1 to RCS0 are 00b (f1), select a frequency matched to f1 by bits RCS4 to RCS2.
Write to the RTCCSR register when both bits TSTART and TCSTF in the RTCCR1 register are 0 (timer
stops).
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 414 of 791