Rev. 2.0, 11/00, page 796 of 1037
28.15.2
Block Diagram
Figure 28.72 shows the block diagram of the sync signal detector.
W
H threshold
register
W
V threshold
register
(6bit)
(4bit)
·
HTR
·
VTR
W
W
H supplement
start time register
Supplemented H pulse width
register
(8bit)
(4bit)
·
HPWR
·
HRTR
W
W
(6bit)
(8bit)
·
NDR
R/W
R/W
R/(W)
R
NOIS
H counter (8-bit)
Noise detector
Supplement control &
noise mask control circuit
Up/Down
counter (6-bit)
SEPH
Selection of
polarity
Noise detection
window
Noise detection interrupt
VD interrupt
Csync
Sync signal detector
H reload counter (8-bit)
Field detector
Noise counter (10-bit)
Toggle
circuit
Clear
FLD
SYCT
VD(SEPV)
FILED
NOISE
IRRSNC
OSCH
NIS/VD
·
SYNCR
·
NWR
Internal bus
s = fosc/2
s/2
Noise detection
window register
Noise
detection register
Figure 28.72 Block Diagram of the Sync Signal Detector
Summary of Contents for Hitachi H8S/2191
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