Program branch instructions
Category
Instruction
symbol
Jump
CJ
SCJ
JMP
GOEND
Program execution control instructions
Category
Instruction
symbol
Disable
DI
interrupts
Enable
EI
interrupts
Interrupt
IMASK
disable/
enable
setting
Return
IRET
I/O refresh instructions
Category
Instruction
symbol
I/O Refresh
RFS
RFSP
2 INSTRUCTION TABLES
46
2.4 Basic Instructions
Symbol
CJ
Pn
SCJ
Pn
JMP
GOEND
Symbol
DI
EI
IMASK
S
IRET
Symbol
RFS
S
n
RFSP
S
n
Processing details
• Jumps to Pn when input
conditions are met.
• Jumps to Pn from the scan
after the meeting of input
condition.
• Jumps unconditionally to Pn.
Pn
• Jumps to END instruction
when input condition is met.
Processing details
• Prohibits the running of an
interrupt program.
• Resets interrupt program
execution prohibition.
• Inhibits or permits interrupts
for each interrupt program.
• Returns to sequence
program from an interrupt
program.
Processing details
• Refreshes the relevant I/O
area during scan.
Execution
Number
Subset Reference
condition
of basic
steps
●
2
●
2
2
●
1
Execution
Number
Subset Reference
condition
of basic
steps
1
1
2
1
Execution
Number
Subset Reference
condition
of basic
steps
3
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