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828
Subroutines
Section 3-19
An SBS(091) or GSBS(750) instruction can be written within a subroutine
region (SBN(092) to RET(093)) or global subroutine region (GSBN(751) to
GRET(752)) to “nest” subroutines. Subroutines can be nested up to 16 levels.
Global Subroutines and
Differentiation
Observe the following precautions when using differentiated instructions (UP,
DOWN, DIFU(013), DIFU(014), or up/down differentiated instructions) in sub-
routines.
The operation of differentiated instructions in a global subroutine is unpredict-
able if a subroutine is executed more than once in the same cycle. In the fol-
lowing example, global subroutine 0001 is executed when CIO 000000 is ON
B
A
D
C
B
GSBS
n
000000
D
GSBS
m
000001
END
A
GSBN
n
C
GSBN
m
GRET
END
GRET
Execution
condition ON
Execution
condition ON
Cyclic or interrupt task
Interrupt task 0
Subroutine functions
divided by task.
GSBN 10
GSBS 11
GRET
GSBN 11
GSBS 12
GRET
GSBN 12
GRET
to
Interrupt task 0
to
to
to
to
Summary of Contents for SYSMAC CS1D-CPU**
Page 3: ...iv...
Page 29: ...xxx...
Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...