Rev. 1.0, 02/00, page 741 of 1141
Sync Signal Control Register (SYNCR)
0
0
1
0
R
2
0
R/(W)*
3
1
4
5
6
1
7
—
—
—
—
—
—
—
—
R/W
R/W
NIS/VD
NOIS
FLD
SYCT
1
1
1
Note: * Only 0 can be written
Bit :
Initial value :
R/W :
SYNCR is an 8-bit register that controls the noise detection, field detection, polarity of the sync
signal input, etc.
It is initialized to H'F8 by a reset, or in stand-by mode. Bits 7 to 4 are reserved. No write is valid.
Bit 1 is read-only.
Bits 7 to 4
Reserved: Cannot be modified and are always read as 1.
Bit 3
Interrupt Selection Bit (NIS/VD): Selects whether an interrupt request is generated by
noise level detection or VD signal detection.
Bit 3
NIS/VD
Description
0
Interrupt at the noise level
1
Interrupt at VD
(Initial value)
Bit 2
Noise Detection Flag (NOIS): NOIS is a status flag indicating that the noise counts
reached at more than four times of the value set in NDR. The flag is cleared only by writing 0
after reading 1. Care is required because it is not cleared automatically.
Bit 2
NOIS
Description
0
Noise count is smaller than four times of the value set in NDR
(Initial value)
1
Noise count is the same or greater than four times of the value set in NDR