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Rev. 2.0, 11/00, page 803 of 1037
(7) 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 controls the noise detection, field detection, polarity of the sync signal input, etc.
SYNCR is an 8-bit register. It is initialized to H'F8 by a reset, stand-by or module stop. Bits
7 to 4 are reserved. No write is valid. Bit 1 is valid for read only.
Bits 7 to 4: Reserved
Writes are disabled. If a read is attempted, an undetermined value is read out.
Bit 3: Interrupt Selection Bit (NIS/VD)
Selects whether an interrupt request is generated when a noise level was detected or when the
VD signal was detected.
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 equal to or greater than four times of the value set in NDR
Содержание Hitachi H8S/2191
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