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DI, EI, IMASK
■When the High Performance model QCPU/Process CPU/Redundant CPU/Universal model
QCPU or LCPU is used
DI
IMASK
EI
(S): Head number of the devices where the interrupt mask data is stored (BIN 16 bits)
Setting
Internal device
data
Bit
(S)
Processing details
■DI
• Disables the execution of an interrupt program until the EI instruction has been executed, even if a start cause for the
interrupt program occurs.
• A DI state is entered when power is turned ON or when the CPU module is reset.
■EI
• The EI instruction is used to clear the interrupt disable state resulting from the execution of the DI instruction, and to create
a state in which the interrupt program designated by the interrupt pointer number enabled by the IMASK instruction and the
fixed cycle execution type program can be executed.
• When the IMASK instruction is not executed, I32 to I47 are disabled.
Sequence program
Sequence program
In
Interrupt programs
6 BASIC INSTRUCTIONS
328
6.6 Program Execution Control Instructions
R, ZR
J\
Word
Bit
DI
Even if a cause of interrupt occurs during
the execution of the sequence program
between the DI and EI instructions,
EI
execution of the interrupt program is
suspended until the processing of the
FEDN
sequence program is completed.
Sequence program
IMASK
U\G
Zn
Word
DI
S
EI
Constant
Others
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