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Chapter 5 Instruction Specifications
5-86
Item number Application instructions-14 Name Block exchange (EXCHANGE)
Ladder format Condition code
Processing time (µs)
Remark
R7F4 R7F3 R7F2 R7F1 R7F0
Average Maximum
XCG (d1, d2, n) DER ERR SD V C
↕
zzzz
Instruction format Number of steps
Condition Steps
As per the table
below.
XCG (d1, d2, n) 4
Bit Word Double word
Usable I/O
XY
R,
M
TD, SS,
CU, CT WX WY
WR,
WM TC DX DY
DR,
DM
Constant
Other
d1
Exchange destination
head I/O
{{
d2 Exchange source head I/O {{
n
Number of bits (words)
to be exchanged
{{{{ {
The constant is set in
decimal.
Function
• Exchanges the contents of the n bits from d1 to d1 + n - 1 and the contents between d2 and d2 + n - 1.
• Bits are exchanged with bits and words are exchanged with words.
d1+n-1
d2+n-1
d1
d2
n bits (words)
If n is a word: The contents (0 to 255) of the lower 8 bits (b7 to b0) of n (WX, WY, WR, WM, TC) are set to the
number of bits (words) to be exchanged.
If n is a constant: 0 to 255 (decimal) can be designated for the number of bits (words) to be exchanged.
Notes
• Use this instruction so that d1 + n − 1 and d2 + n - 1 do not exceed the I/O range (R7BF, M3FFF, WRFFF, and WM3FF). If they
exceeds the I/O range, DER is equal to '1' and the exchange is performed up to the maximum range with respect to the smaller number of
bits (words) specified in d1 and d2.
• If n is equal to “0,” the block exchange is not performed and DER (R7F4) will be set to “0.”
Program example
X00001 DIF1
XCG (WM000, WM100, 256)
LD X00001
AND DIF1
[
XCG (WM000, WM100, 256)
]
Program description
• When X00001 rises, the contents of WM000 to WM0FF are exchanged with the contents of WM100 to WM1FF.
XCG (d1, d2, n)
Processing time (
µ
s) (Average)
n
Bit Word
1 139 120
16 338 159
32 528 207
64 918 284
128 1899 449
255 3695 779