2.3.3.2 Switch Status
Read Section
The state of each switch is read periodically by the sub CPU through analog ports
to AN7. When
the state of a switch is found to be different from the previous value, the new value is transferred to
the LED drive and LCD control/drive sections as data to rewrite the switch status.
Since the states of 11 switches must be read using only the three input ports
to
a matrix
circuit is constructed using four control signals (O 15 and 016 of the MSM59371,
and
(See
Table 2-34).
The state of the ON LINE switch is monitored using port PC3 of the sub CPU via LPF (consisting of R66
and
Table 2-34. Switch Status Reading
M S M 5 9 3 7 1
SUB CPU
(OUT)
(IN)
Control Signal Status
Switches Read
0 1 6
0 1 5
1
0
0
0
o
1
0
0
o
0
1
0
—
o
0
0
0
1
2
NOTE:
Refer to Table A-40
for the layout of the switches.
2-57
Summary of Contents for LQ-2550
Page 1: ...L Q 2 5 5 0 TECHNICAL MANUAL EPSON ...
Page 240: ...REV A P r cl Figure 6 3 LQ 2550 Lubrication and Adhesive Application Points Diagram 2 6 3 ...
Page 241: ...REV A 7 i_ Figure 6 4 LQ 2550 Lubrication and Adhesive Application Points Diagram 3 6 4 ...
Page 252: ...REV A I 1 I 7 v m o m x b Figure A 6 PPD781OHG Block Diagram A 7 ...
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