Rev. 1.0, 02/00, page 696 of 1141
REC-CTL Duty Data Register 5 (RCDR5)
1
1
1
1
13
14
15
1
0
3
2
5
4
7
6
9
8
11
10
CMT51
W
12
—
—
—
—
—
—
—
—
0
CMT50
W
0
CMT53
W
0
CMT52
W
0
CMT55
W
0
CMT54
W
0
CMT57
W
0
CMT56
W
0
CMT59
W
0
CMT58
W
0
CMT5B
W
0
CMT5A
W
0
Bit :
Initial value :
R/W :
RCDR5 is a 12-bit write-only register that sets the timing of falling edge of the 0 pulse (short) of
REC-CTL in record or rewrite mode. In detection mode, it is used to detect the long/short pulse.
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 no write in
them is valid.
It is initialized to H'F000 by a reset, stand-by or module stop.
In record mode, set a value with the 62.5 percent duty cycle obtained from the set time T5
corresponding to the frequency
φ
s according to the following equation. See figure 26.60, REC-
CTL Signal Generation Timing.
RCDR5 = T5
×
φ
s/64
φ
is the servo clock frequency (= f
OSC
/2) in Hz, and T5 is the set timing (s).
At bit pattern detection, set the 1 pulse long/short threshold value at REV. See figure 26.56, Duty
Discriminator.
RCDR5 = H'FFF
−
(T5'
×
φ
s/80)
φ
s is the servo clock frequency (= f
OSC
/2) in Hz, and T5' is the 1 pulse long/short threshold value at
REV (s).