2-253
2 Instructions
CP1E CPU Unit Instructions Reference Manual(W483)
Table Data Processing
Instructions
2
SWAPTable Data Processing Instructions

SWAP

Applicable Program Areas
Operands

N: Number of words

N specifies the number of words in the range and must be 0001 to FFFF hexadecimal (or &1 to
&65,535).

R1: First word in range

Note R1 and R1+(N-1) must be in the same data area.
ī€Operand Specifications
Flags
Instruction Mnemonic Variations Function
code Function
SWAP BYTES SWAP @SWAP 637 Switches the leftmost and rightmost bytes in all of the words in the range.
Symbol
SWAP
Area Step program areas Subroutines Interrupt tasks
Usage OK OK OK
Operand Description Data type Size
N Number of words UINT 1
R1 First word in range UINT Variable
Area Word addresses Indirect DM addresses Constants CF Pulse bits TR bits
CIO WR HR AR T C DM @DM *DM
NOK OK OK OK OK OK OK OK OK OK --- --- ---
R1 ---
Name Label Operation
Error Flag P_ER ā€¢ON if the N is 0.
ā€¢OFF in all other cases.
N: Number of words
R1: First word in range
SWAP(637)
N
R1
R1
R1+(Nā€“1)
15 08 7
to to to
Leftmost byte Rightmost byte