165
Example In
the following example, the content of C (HR 00) is 9010, and COLL(81) is
used
to copy the oldest entries from a10-word stack (IR 001 to IR 010) to LR 20.
Stack
pointer
decremented
After one
execution
After two
executions
DIST(80)
001
HR 00
LR 20
00001
Address Instruction Operands
00000 LD 00001
00001 COLL(81)
001
HR 00
LR 20
IR
001
Before
execution
1234
00
0
2
ABCD
ABCD
00
0
1 00
0
0
IR 002
IR 003
IR 010
IR 001
IR 002
IR 003
IR 010
IR 001
IR 002
IR 003
IR 010
Output
1234
LR 20
Output
ABCD
LR 20
Stack pointer
decremented
Stack pointer
Stack area
When
the execution condition is OFF
, COLL(81) is
not executed. When the exe
-
cution
condition is ON, COLL(81) copies the data most recently recorded in the
stack to D. The stack pointer, SBs, is then decremented by 1.
Specifies
the stack length (000 to 999).
A value of 8 indicates LIFO stack operation.
Digits of C:
3210
Data
can be added to the stack until it is full. DIST(80)’
s stack operation can
be
used together with COLL(81)’s read stack operation. COLL(81) can be set to
read on a FIFO or LIFO basis. Refer to 5-16-6 SINGLE WORD DISTRIBUTE
(80) for details.
Note LIFO stands for Last-In-First-Out.
LIFO Stack Operation
(C=8000 to 8999)
Data Movement Section 5-16
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