CHAPTER 2
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COPYRIGHT © 1999 CANON INC. CANOSCAN FB330/FB630 SERIES REV.0 OCT. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Host computer
Scanner
Printer
IV. CONTROL SYSTEM
A. CanoScan FB330P/FB630P
1. Outline
CanoScan FB330P/FB630P control system consists of the CPU and gate array. The CPU
has 7 digital ports. P0, P2, P3, P6, and P7 are for generating control signals in the main PCB.
P4 is for address bus and data bus (AD-AD7) and P5 is for address bus (A8-A15). P7 is mainly
for inputting a function check mode setting.
Figure 2-29
2. Control Switching Between Printer And Scanner
CanoScan FB330P/FB630P has two parallel ports which allow to connect in order of the
host computer, scanner and printer as shown in Figure 2-30. When the host computer sends
the signal to start the communication with the scanner, the control is switched between printer
and scanner.
Figure 2-30
The host computer sends the command to select the scanner or the printer to communicate
with.
Gate Array
P0, P2, P3,
P6, P7
AD0~7
A8~15
CPU
P4
P5
To host computer
Control signal