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To process the B/W input signal, maximum
input signal are controlled by calibrating MUXA
and MUXB in the high state for the maximum
level, and setting them to earth for the minimum
level.
The CIS driver clock frequency is 250 kHz. A 75%
duty cycle is used to lengthen the charging time. A
CLOCK -
Scanner Image
Processing
Figure 5-9: Scanner Interface Block Diagram
1 LINE
Processing to compensate for CIS shading
distortion is controlled with MUXA 'low' and
'high, and MUXB 'low'. For half-tone, MUXA is
'low', and MUXB is 'high'.
External Circuits
. . . . . . . . . . . . . . . . . . ,
: E x t e r n a l
RAM
.
RAM
start signal is provided every 10 ms to match the
line scanning time. Actual image signal is
provided in less than 6.8 ms, using the 250 kHz
clock and taking A4 paper size into consideration.
Circuit Description
:
Scanner
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