275
Data Movement Instructions
Section 5-18
EQ:
ON when the content of S is zero; otherwise OFF.
5-18-7 DATA COLLECT – COLL(81)
Limitations
C must be BCD.
DM 6144 to DM 6655 cannot be used for D.
Description
COLL(81) can be used for data collection, an FIFO stack operation, or an
LIFO stack operation depending on the content of the control word, C.
Data Collection
When bits 12 to 15 of C=0 to 7, COLL(81) is used for data collection. The
entire contents of C specifies an offset, Of.
When the execution condition is OFF, COLL(81) is not executed. When the
execution condition is ON, COLL(81) copies the content of SBs + Of to D, i.e.,
Of is added to SBs to determine the source word.
Note
SBs and SBs+Of must be in the same data area.
Example
The following example shows how to use COLL(81) to copy the content of
DM 0000+Of to IR 001. The content of 010 is #0005, so the content of
DM 0005 (DM 0000 + 5) is copied to IR 001 when IR 00001 is ON.
FIFO Stack Operation
When bits 12 to 15 of C=9, COLL(81) can be used for an FIFO stack opera-
tion. The other 3 digits of C specify the number of words in the stack (000 to
999). The content of SBs is the stack pointer.
When the execution condition is ON, COLL(81) shifts the contents of each
word within the stack down by one address, finally shifting the data from
SBs+1 (the first value written to the stack) to the destination word (D). The
content of the stack pointer (SBs) is then decremented by one.
SBs
:
Source base word
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
C
:
Control word (BCD)
IR, SR, AR, DM, EM, HR, TIM/CNT, LR, #
Ladder Symbols
Operand Data Areas
D
:
Destination word
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
COLL(81)
SBs
C
D
@COLL(81)
SBs
C
D
@COLL(81)
DM 0000
010
001
00001
Address
Instruction
Operands
00000
LD
00001
00001
@DIST(80)
DM
0000
010
001
F
001
0 0 F
0
DM 0000
0 0 0
F
DM 0005
0 0 F
5
010
0 0 0
