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Cycle Time/High-speed Processing Section 6-1
Note The communications ports (internal logical ports) in the CPU Unit are used
both for background execution and the following instructions
• SEND(090), RECV(098), and CMND(490) (Network Communications
Instructions)
• PMCR(260) (PROTOCOL MACRO)
Background instructions and the above instructions cannot be executed
simultaneously on the same port. Use the Communications Port Enabled
Flags to be sure that only one instruction is executed on each port at any one
time.
Note If an instruction is specified for execution in the background for a port
for which the Communications Port Enabled Flag is OFF, the ER Flag
will turn ON and the background instruction will not be executed.
Communications Port Enabled Flags
The Communications Port Enabled Flags are ON when the port is not being
used and OFF when processing is being performed on the port.
Background
Execution ER/
AER Flag
A39510 Turns ON when an instruction execution error or illegal
access error occurs in an instruction being executed in
the background. Turns OFF when power is turned ON
or operation is started.
Background
Execution
IR00 Output
A595 and
A596
These words receives the output when the output of an
instruction executed in the background is specified for
an index register. No output will be made to IR00.
Range: 0000 0000 to FFFF FFFF Hex
Lower 4 digits: A595, Upper 4 digits: A596
Background
Execution
DR00 Output
A597 This word receives the output when the output of an
instruction executed in the background is specified for a
data register. No output will be made to DR00.
Range: 0000 to FFFF Hex
Background
Execution
Equals Flag
Output
A59801 This flag is turned ON when matching data is found for
a SRCH(181) executed in the background.
Name Address Description
Communications Port
Enabled Flag
Background instruction
processing for user
program
Instruction
executed
Cycle time
Cycle time
Cycle time
Background execution
I/O refresh
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