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ECALL(P)
(5) From to can be used by the ECALL instruction.
(6) The device used in the argument of the ECALL instruction should not be used in a
subroutine program.
If used, it will not be possible to obtain accurate calculations. (Refer to the following
program example.)
Incorrect operation example
The following example shows the operation performed when D0 is specified for FD0 in the
subroutine program and D1 is used in the subroutine program.
[Program example]
[Operation performed after subroutine program execution]
*1: Stores the execution result of the subroutine program.
*2: Replaced by the value of the function device.
*3: D1 does not reflect the value of the function device.
S1
S5
D0
D3
D2
D1
0
Indefinite
Indefinite
Indefinite
Indefinite
1000
100
10
D0
D3
D2
D1
0
1000
100
10
0
1000
100
10
Immediately after the
execution of ECALL
instruction
Transfer
D0
D3
D2
D1
33 *2
Indefinite
Indefinite
Indefinite
Indefinite
1000 *2
100 *2
110 *3
D0
D3
D2
D1
0
1000
100
1 *1
33 *1
1000
100
110 *1
After the execution
of RET instruction
FD0 FD0 FD0 FD0
Transfer
Before the execution
of subroutine program
At the time of
subroutine program
execution