MIL-DTL-62736A(AT)
3.3.7.4 MDU register load. After latching the data from table VIII into U9 to select the
MDU Control, X, Y, or Z register by applying the waveforms in figure 2, the data from the
register selected shall be loaded by applying the waveforms in figure 3.
3.3.7.5 MDU register read. After latching the data from table VIII into U9 to select the
MDU Status, X, Y, or Z register by applying the waveforms in figure 2, the data from the register
selected shall be read by applying the waveforms in figure 4.
3.3.7.6 Multiply with add. The MDU shall multiply a 16 bit operand that has been loaded
into MDU register X by a 16 bit operand that has been loaded into MDU register Z, then add a
16 bit operand that has been loaded into MDU register Y. The MDU shall produce a 32 bit
result, the high order 16 bits of which shall be read from the MDU Y register and the low order
bits of which shall be read from the MDU Z register, a minimum of 17 microseconds (µs) after the
operation is started by loading the MDU control register.
3.3.7.7 Divide with overflow indication. The MDU shall divide a 32 bit operand, the high
order 16 bits of which have been loaded into MDU register Y and the low order 16 bits of which
have been loaded into MDU register Z, by a 16 bit operand that has been loaded into MDU
register X. The MDU shall produce a 16 bit result that shall be read from the MDU Y register and
a 16 bit remainder that shall be read from the MDU Z register. This result and any overflow
indication in the MDU status register shall be available 17 µs after the operation is started by
loading the MDU control register.
3.3.8 Communications.
3.3.8.1 Universal Asynchronous Receiver/Transmitter (UART) crystal oscillator. The
signal at Y1 pin 8 shall have a frequency of 2.4576 MHz + 250 kHz.
3.3.8.2 Crystal frequency division. U5 pins 6, 5, 3, 2, 4, 13, 12, and 14 shall be the
frequencies listed in table IX.
TABLE IX. U5 frequencies.
U5 Pin
Frequency
6
307.20 kHz + 307 Hz 1/
5
153.60 kHz + 154 Hz
3
76.800 kHz + 77 Hz
2
38.400 kHz + 38 Hz
4
19.200 kHz + 19 Hz
13
9.6000 kHz + 10 Hz
12
4.8000 kHz + 5 Hz
14
2.4000 kHz + 2 Hz
1/ hertz (Hz).
8
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