
2.3.3.2 Switch Status Read Section
The state of each switch is read periodically by the CPU through five ports
and
When the state of a switch is found to be different from the previous value, the new value is transferred
to the LED drive section as data to rewrite the switch status.
Since the states of 23 switches and 2 jumper settings must be read using only the five input ports
and
a matrix circuit is constructed using five control signals (See Table 2-23).
Table 2-23. Switch Status Reading
CPU
Control Signal Status
Switches Read
(direction : out)
(direction : in)
0
0
0
0
o
1
0
0
0
o
0
1
0
0
S W 1 O
- 1
- 6
o
0
0
1
0
[J8]
o
0
0
0
1
[J9]
3TES: 1. The parenthesized names are the
names from connector
2. The names enclosed in [ ] are jumpers.
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