Cblank Output; Figure 14.9 Cblank Output Waveform Generation - Renesas H8S/2158 User Manual

Section 14 Timer Connection
Mode IVI Signal
Separate VSYNCI
mode input
14.4.9

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 logic of CBLANK output waveform generation is shown in figure 14.9.
HFBACKI input (positive)
VFBACKI input (positive)
IVO signal (positive)

Figure 14.9 CBLANK Output Waveform Generation

Rev. 3.00 Jan 25, 2006 page 372 of 872
REJ09B0286-0300
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 unless 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 signal is synchronized with
HSYNCI input (horizontal synchronization
signal) before output
Internal synchronization signal is output
Reset
Q
Set
CBLANK signal
(positive)