gc80c520a CORERIVER Semiconductor, gc80c520a Datasheet - Page 155

• Manufacturer Part Number: gc80c520a
• Description: Midas1.0 Family Mask Rom/eprom/romless 8-bit Turbo Microcontrollers
• Manufacturer: CORERIVER Semiconductor

XCH
XCH A, Rn
XCH A, direct
XCH A, @Ri
Description:
Operation:
Operation:
Operation:
Encoding:
Encoding:
Encoding:
A, <byte>
Function:
Example:
MiDAS1.0 Family
Cycles:
Cycles:
Cycles:
Bytes:
Bytes:
Bytes:
Exchange Accumulator with byte variable
XCH leads 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.
R0 contains the address 20h. The Accumulator holds the value 3Fh
(00111111b). Internal RAM location 20h holds the value 75h (01110101b). The
instruction,
XCH A, @R0
will leave RAM location 20h holding the values 3Fh (00111111b) and 75h
(01110101b) in the accumulator.
1
1
XCH
(A)
2
2
XCH
(A)
1
1
XCH
(A)
1
1
1
↔
↔
↔
1
1
1
(Rn)
(direct)
((Ri))
0
0
0
0
0
0
1
0 1 0 1
0
1
r
Page 155 of 187
r
1
r
i
direct address