Cblank Output; Figure 13.17 Cblank Output Waveform Generation - Renesas H8S/2437 Hardware Manual

Mode IVI Signal
Separate VSYNCI
mode input
13.4.9

CBLANK Output

Using the signals generated/selected with the timer connection, it is possible to generate an
waveform based on the composite synchronization signal (blanking waveform). This function is
not available in channel 1.
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, and with
the IVO signal.
The logic of CBLANK output waveform generation is shown in figure 13.17.
HFBACKI input (positive)
VFBACKI input (positive)
IVO signal (positive)

Figure 13.17 CBLANK Output Waveform Generation

Rev. 1.00, 09/03, page 398 of 704
IVO Signal
IVI signal (without fall
modification or IHI
synchronization)
IVI signal (without fall
modification, with IHI
synchronization)
IVI signal (with fall
modification, without IHI
synchronization)
IVI signal (with fall
modification and IHI
synchronization)
IVG signal
Falling edge sensing
Rising edge sensing
Meaning of IVO Signal
VSYNCI input (vertical synchronization
signal) is output directly
Meaningless if VSYNCI input (vertical
synchronization signal) is synchronized
with HSYNCI input (horizontal
synchronization signal)
VSYNCI input (vertical synchronization
signal) fall is modified before output
VSYNCI input (vertical synchronization
signal) fall is modified and the signal is
synchronized with HSYNCI input
(horizontal synchronization signal) before
output
Internal synchronization signal is output
Reset
Q
Set
CBLANK signal
(positive)