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Signal
I/O
Name
EXSFT
I
Sets exposure
time.
Begins frame
transfer.
VREF
O
Signifies when
valid vertical
lines are being
read.
EXHT
I
External
horizontal clock.
HREF
O
Signifies when
valid part of
horizontal line is
being read.
PCLK
O
Pixel clock.
Table 5-1. Mode 3 Signal Function Summary
Significance of
Function
Negative Edge
Causes the CCD
to begin exposing.
Reading of valid
vertical lines is
complete.
Triggers the
reading of the next
horizontal line of
the CCD.
Reading of valid
part of line is
complete.
None
Significance of
Positive Edge
Causes the CCD to
stop exposing.
Begins transfer of
pixel data from that
exposure (frame
transfer).
Reading of valid
vertical lines has
begun.
None
Reading of valid part
of line has begun.
Indicates the 8-bit
pixel data is available
to be read out.
Application Notes
Comment
The period
between
successive positive
edges is called a
frame.
The period of
EXHT is known as
a line time and is
denoted "H".
The period of PCLK
is denoted "T".
5-7
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