Rev. 1.0, 02/00, page 778 of 1141
Csync
HVTH
SEPH
OSCH
Tm2
Tm
Th
5
µ
s
HC
HM
Digital H separation
counter
Noise
Killer
Killer
Killer
Killer
Killer
Killer
Killer
Killer
Pulse
lost
Comple-
mentary
pulse
H complement and
mask counter
HHK
(for counter reset)
HHK2
(for OSCH generation)
Figure 27.12 Complement and Mask Timing of the H Complement and Mask Counter
Bits 15 to 7
H Complementary Pulse Setting (HC8 to HC0): Specify the timing for
generating a complementary pulse when an Hsync pulse is lost. If no Hsync pulse is input within
the specified time, a complementary pulse is generated from the H complement and mask counter
and interpolated to the OSCH signal.
The following shows examples of HC8 to HC0 settings.
Condition:
(HC + 1)
×
(2/OSC) > 63.5
µ
s (PAL: 64
µ
s)
System clock OSC = 10 MHz
2/OSC: 5 MHz (0.2
µ
s
)
Example 1: To set the timing for NTSC
NTSC: 63.5
µ
s
63.5
µ
s / 0.2
µ
s = 317.5
HC8 to HC0 value = H'13E (318)
Example 2: To set the timing for PAL
PAL: 64
µ
s
64
µ
s / 0.2
µ
s = 320
HC8 to HC0 value = H'141 (321)