Rev. 2.0, 11/00, page 807 of 1037
[Legend]
SEPH
Noise detection
window
Noise mask for
OSCH
OSCH
Noise mask for
H counter
H reload
counter
H counter
SEPH
c
OSCH
: Horizontal sync signal after detection
: Horizontal sync signal after supplement
a
b
: Value set for the noise detection window (NWR5 to NWR0)
: Value set for the pulse width of the horizontal sync signal (NPWR3 to NPWR0)
c
a, b, c
: Value set for supplement timing (HRTR7 to HRTR0)
: Complements of 1 of a,b,c, respectively
H ' E 8
TH
:Complement of 2 of multiplier 24 in the equation for the noise mask period
(The noise mask period ends 24 counts before the overflow of H reload counter.)
: Cycle of the horizontal sync signal
(NTSC:63.6 [ms], PAL:64[ms])
TM : Timing at which the noise mask period ends.
Drop-out of the horizontal
sync signal
Ignore signal during noise
mask period.
TH
a
b
H'00
OVF
H'E8
c
a
Mask
period
Period determined
by NWR5 to NWR0
Mask
period
TM
Mask
period
Mask
period
Mask
period
Mask
period
Mask
period
Mask
period
TH
Don't mask
immediately
after
supplement
period deter-
mined
by a and a
Period determined
by HRTR7 to HRTR0
period determined
by c and H'E8
Period determined
by HPWR3 to HPER0
period
determined
by b
Do mask also im-
mediately after
supplement.
Figure 28.75 Set Period for HRTR, HPWR and NWR
Содержание Hitachi H8S/2191
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Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
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