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TM 11-5820-890-30-5
6-3.
MICROCONTROLLER (7A2). Continued
The inputs required by the microcontroller are as follows:
SIGNAL
PIN
DESCRIPTION
CM DATA
RCV DATA
2880 DET-N
640 Hz
320 kHz
1.92 MHz
CLR-N
DMA-OUT-N
OUT 3 STROBE
K
L
M
N
C
e
d
f
I
Data received from other control-monitor. Serial data format, 6740 Hz.
From analog module.
Data received from RT. Serial data format, 640-Hz. From analog module.
Control line from analog module. Goes to logic 0 when data is received
from RT.
Digital clock signal from decoder/timer.
Digital clock signal from decoder/timer.
Digital clock signal from decoder/timer.
Normally logic 1. Goes to logic 0 for 1 second at turn-on. From
decoder/timer.
1.5 µs logic 0 pulse every 1.56 ms from decoder/timer.
1.5 µs logic 1 pulse from decoder/timer.
The outputs provided by the microcontroller are as follows:
SIGNAL
PIN
DESCRIPTION
DATA DISPLAY
A
320-kHz digital data stream. Directs displays.
DISPLAY CLK
B
320-kHz clock. Provides display data timing.
PROCESSOR Q c
Goes to logic 1 when FSK data is to be transmitted.
MEM REQ DATA-N Z
Logic 0 pulse train for 3.4 µs when active.
TIMING PULSE A g
Timing pulse train, logic 1 for 0.5 µs.
and B
J
N0, N1, and N2 O
Logic 1 for 1.5 µs.
P
Q
STATE CODE 0 a
Logic 1 or 0 for 8.3 µs.
STATE CODE 1 b
Logic 1 for 8.3 µs every 1.56 ms.
Information is passed between the microcontroller and the decoder/timer on the data bus. This is the
microprocessor DATA BUS B0 through DATA BUS 67 lines (microcontroller pins R, S, T, U, V, W, X, and Y). Data
transfers both ways on the bus.
Data from the RT is input on the RCV DATA line. Data to be sent to the RT is sent to the decoder/timer on the data
bus.
Data from the other control-monitor is input on the CM DATA line. Data to be sent to the other control-monitor is
sent on the PROCESSOR Q line.
6-4
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