6F3B0250
Basic Hardware and Function
221
7. Instructions
FUN 128
CALL
Subroutine call
Expression
Input
-
[ CALL N.
n
]
-
Output
Function
When the input is ON, this instruction calls the subroutine number
n.
Execution condition
Input
Operation
Output
OFF
No execution
OFF
ON
Execution
ON
Operand
Name
Device
Register
Constant Index
X
Y
R
S
T.
C. XW YW RW SW
T
C
D
I
J
K
n
Subroutine
number
Ö
(Note)
Example
When X007 is ON, the subroutine number 8 is called. When the program execution is returned
from the subroutine, the output is turned ON.
Main program
Subroutine
| | [ CALL N.008 ]
[ SUBR (008)]
[ RET ]
Note
·
The possible subroutine number is 0 to 15 (T1) or 0 to 255 (T1S).
·
Refer to the SUBR instruction (FUN 137).
·
In case of T1, nesting of subroutines is not allowed. That is, the CALL instruction cannot be used in
a subroutine.
·
In case of T1S, nesting of subroutines is possible. (up to 3 levels)
·
The CALL instruction can be used in an interrupt program. However, it is not allowed that the same
subroutine is called from an interrupt program and from main program.
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