Rev. 1.0, 02/00, page 625 of 1141
Bit 2
Drum Phase System Filter Computation Automatic Start Bit (DPCNT): Enables the
filter computation of the phase system if an underflow occurred in the drum lock counter.
Bit 2
DPCNT
Description
0
Disables the filter computation by detection of the drum lock.
(Initial value)
1
Enables the filter computation of the phase system when drum lock is
detected.
Bits 1 and 0
Drum Lock Counter Setting Bits (DFRCS1, DFRCS0): Sets the number of times
to detect drum locks (which means the number of times DFG is detected in the range set by the
lock range data register). The drum lock flag is set when the specified number of drum locks is
detected. If the NCDFG signal is detected outside the lock range after data is written in DFRCS1
and DFRCS0, the data will be stored in the lock counter.
Note:
If DFRCS1 or DFRCS0 is read-accessed, the counter value is read out. If bit 3 (drum lock
flag) is 1 and the drum lock counter's value is 3, it indicates that the drum speed system is
locked. The drum lock counter stops until lock is released after underflow.
Bit 1
Bit 0
DFRCS1
DFRCS0
Description
0
Underflow occurs after lock was detected once.
(Initial value)
0
1
Underflow occurs after lock was detected twice.
0
Underflow occurs after lock was detected three times.
1
1
Underflow occurs after lock was detected four times.