Rev. 1.0, 02/00, page 772 of 1141
Csync
HVTH
SEPH
HHK
OSCH
HC
Digital H separation
counter
Hsync-Vsync
phase-difference
error
Pulse
lost
H complement
and mask counter
Comple-
ment
Comple-
ment
Figure 27.5 Timing of Hsync-Vsync Phase-Difference Error
When Equalizing Pulse Lost at Hsync Pulse Position
Note:
When 2.35-
µ
s equalizing pulses are eliminated, the complement function operates for the
eliminated period. Accordingly, the rising edge of the Vsync signal for the even field is
detected as an Hsync pulse. Therefore, to not generate an Hsync pulse at this position, set
the HHKON bit (bit 2) of the SEPCR to 1 so that the HHK function is forcibly operated
when complementary pulses are inserted three successive times. Figures 27.6 and 27.7
show this timing.
Csync
HVTH
SEPH
HHK
OSCH
HC
Digital H separation
counter
Comple-
ment
Comple-
ment
Comple-
ment
Comple-
ment
Phase-difference
error
H complement and
mask counter
Comple-
ment
Comple-
ment
Comple-
ment
Figure 27.6 Timing of Hsync-Vsync Phase-Difference Error
When Equalizing Pulse Not Detected