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Page Title:
Table 5-1. Microprocessor Input Ports - continued |
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 TM 11-5865-215-13
Table 5-1.
Microprocessor Input Ports - Continued
Output
control
I
(OC) bits
Input
Associated
port
Function
3210
hardware
I
0111
CCA A5
The IB70 signal line provides a path for trans-
7
fer of the 51-bit (mode 2) or 64-bit (mode 1)
serial receiver command data from a buffer reg-
ister on CCA A5. This buffer has previously
received the command data from the computer.
Microprocessor Output Ports
Output
control
(OC) bits
Output
Associated
Function
port
hardware
3210
0
Selects front panel keyboard row which is read
Front
0000
by the microprocessor via input ports 4, 5,
panel
and 6 (see table 5-l).
keyboard
Select keyboard row
OBOO OBO1 0B02 0B03
--
0
1
1
1
Row
1
(code
1)
Row
2
(code
2)
1
0
1
1
Row
3
(code
3)
1
1
0
1
Row
4
(code
4)
1
1
1
0
0010
Path by which microprocessor writes numeric
2
Front
value into a front panel TUNING FREQUENCY
panel
(MHZ) display digit. The display digit is
TUNING
previously selected by output port 9.
(MHz)
Numeric value
display,
display
0B23 0B22 0B21 0B20
CCA A5
0
0
0
0
0
1
0
0
0
1
0
2
0
1
0
3
0
0
1
1
4
0
1
0
0
0
1
0
1
5
6
0
1
1
0
7
0
1
1
1
8
1
0
0
0
9
1
0
0
1
1
0
1
0
[
1
0
1
1
]
5-8
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