Siemens C500 User Manual page 102

XCH A, <byte>
Function: Exchange accumulator with byte variable
Description: XCH loads the accumulator with the contents of the indicated variable, at the same
time writing the original accumulator contents to the indicated variable. The source/
destination operand can use register, direct, or register-indirect addressing.
Example: R0 contains the address 20 H . The accumulator holds the value 3F H (00111111 B ).
Internal RAM location 20 H holds the value 75 H (01110101 B ). The instruction
XCH
will leave RAM location 20 H holding the value 3F H (00111111 B ) and 75 H
(01110101 B ) in the accumulator.
XCH A,Rn
Operation: XCH
¬ ®
(A)
Encoding: 1 1 0 0
Bytes: 1
Cycles: 1
XCH A,direct
Operation: XCH
¬ ®
(A)
Encoding: 1 1 0 0
Bytes: 2
Cycles: 1
Semiconductor Group
A, @R0
(Rn)
1 r r r
(direct)
0 1 0 1 direct address
4-76
Instruction Set
C500 Family
1998-04-01