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Table 13.10 Meaning of VSYNCO Output in Each Mode (cont)
Mode
IVI Signal
IVO Signal
Meaning of IVO Signal
Separate
mode
VSYNCI
input
IVI signal (without fall
modification or IHI
synchronization)
VSYNCI input (vertical synchronization
signal) is output directly
IVI signal (without fall
modification, with IHI
synchronization)
Meaningless unless VSYNCI input (vertical
synchronization signal) is synchronized with
HSYNCI input (horizontal synchronization
signal)
IVI signal (with fall
modification, without IHI
synchronization)
VSYNCI input (vertical synchronization
signal) fall is modified before output
IVI signal (with fall
modification and IHI
synchronization)
VSYNCI input (vertical synchronization
signal) fall is modified and signal is
synchronized with HSYNCI input (horizontal
synchronization signal) before output
IVG signal
Internal synchronization signal is output
13.3.9
CBLANK Output
Using the signals generated/selected with timer connection, it is possible to generate a waveform
based on the composite synchronization signal (blanking waveform).
One kind of blanking waveform is generated by combining HFBACKI and VFBACKI inputs,
with the phase polarity made positive by means of bits HFINV and VFINV in TCONRI, with the
IVO signal.
The composition logic is shown in figure 13.9.
Reset
Set
CBLANK signal
(positive)
HFBACKI input (positive)
VFBACKI input (positive)
IVO signal (positive)
Q
Falling edge sensing
Rising edge sensing
Figure 13.9 CBLANK Output Waveform Generation