Rev. 1.0, 02/00, page 692 of 1141
REC-CTL Duty Data Register 1 (RCDR1)
13
14
15
1
0
3
2
5
4
7
6
9
8
11
10
CMT11
W
12
1
1
1
1
—
—
—
—
—
—
—
—
0
CMT10
W
0
CMT13
W
0
CMT12
W
0
CMT15
W
0
CMT14
W
0
CMT17
W
0
CMT16
W
0
CMT19
W
0
CMT18
W
0
CMT1B
W
0
CMT1A
W
0
Bit :
Initial value :
R/W :
RCDR1 is a 12-bit write-only register that sets the REC-CTL rising timing. This setting is valid
only for recording and rewriting, and is not used in detection.
Only a word access is valid. If a byte access is attempted, correct operation is not guaranteed. If a
read is attempted, an undetermined value is read out. Bits 15 to 12 are reserved and are not
affected by write access.
RCDR1 is initialized to H'F000 by a reset, and in standby mode, module stop mode and CTL stop
mode.
The value to set in RCDR1 can be calculated from the transition timing T1 and the servo clock
frequency
φ
s by the equation given below. See figure 26.60, REC-CTL Signal Generation
Timing. Any transition timing can be set. The timing should be selected with attention to
playback tracking compensation and the latch timing for phase control.
RCDR1 = T1
×
φ
s/64
φ
s is the servo clock frequency (= f
OSC
/2) in Hz, and T1 is the set timing (s).
Note:
0 cannot be set to RCDR1. Set a value 1 or above.