Table of Contents
Advertisement
26.3.4
Register Description
Reference Period Mode Register (RFM)
Bit :
RCS
Initial value :
R/W :
RFM is an 8-bit write-only register which determines the operational state of the reference signal
generators. If a read is attempted, an undetermined value is read out.
It is initialized to H'00 by a reset and in stand-by and module stop modes.
RFM is accessible in byte units only. If accessed by a word, correct operation is not guaranteed.
Bit 7 Clock Source Selection Bit (RCS): Selects the clock source supplied to the counter.
(φs = fosc/2)
Bit 7
RCS
Description
φs/2
0
φs/4
1
Bit 6 Mode Selection Bit (VNA): Selects the mode for controlling transition to free-run
operation when the REF30 signal is generated synchronously with the VD signal in REC mode:
automatic mode which controls the transition by the V noise detection signal detected by the sync
signal detection circuit, or manual mode which controls the transition by software.
Bit 6
VNA
Description
0
Manual mode
1
Automatic mode
7
6
VNA
CVS
0
0
W
W
5
4
REX
CRD
0
0
W
W
3
2
OD/EV
VST
0
0
W
W
Rev. 1.0, 02/00, page 569 of 1141
1
0
VEG
0
0
W
W
(Initial value)
(Initial value)
Advertisement
Table of Contents
