Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 530

3.
Interrupt program
The following processing is added to a fixed scan interrupt program (10ms).
The fixed scan interrupt program outputs ASCII codes from the output module and controls the strobe
signal.
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The following signals are
all turned off when all
strings are output.
Yn0 to Yn7 (ASCII code)
Yn8 (strobe signal)
Yn9 (in-execution flag)
Status 0:
One character is extracted
from the output string using
the MIDR instruction and
output to the Y module.
The strobe signal is turned
off for 10ms.
Status 1:
The strobe signal is turned on for
10ms.
Status 2:
The strobe signal is turned off
for 10ms.
The status value is incremented
by one.
Status 3:
The status value is returned
to 0 since the output
processing of one character
is completed. The next
character is extracted.