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Table 5-1. Microprocessor Input Ports
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TM-11-5865-215-13 Receiver Control C-10026/USQ NSN
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Table 5-1. Microprocessor Input Ports - continued - TM-11-5865-215-130040
TM 11-5865-215-13
Table 5-1.
Microprocessor Input Ports - Continued
Output
control
(OC) bits
Input
Associated
port
3210
hardware
Function
0010
NOTE
(cent)
As shown above, the following
applies:
Cl - C6 =
clarifier bits
mgc control bits
Ml - M5 =
x=
not used
STP =
step change bit
SWP =
sweep change bit
=
manual tune
increase = 1
decrease = 0
MTB = manual tune change bit
0100
4
Front
Permits microprocessor to identify which
front panel key is pressed.  This port
panel
defines one of 4 possible columns as the
location of the pressed key.  Further iden-
tification of the key depends on the key-
board row previously selected by output port
O (see output port O on table 5-2).
Meaning
IB43 IB42 IB41 IB40
No key in columns
1
1
1
1
1, 2, 3 or 4 is
pressed.
A key in column 1
1
1
1
0
is pressed.
A key in column 2
1
1
0
1
is pressed.
A key in column 3
1
0
1
1
is pressed.
A key in column 4
0
1
1
1
is pressed.
5-6

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