Maxim Integrated MAXQ622 - Manual (Page 235)

MAXQ612/MAXQ622 User’s Guide
Maxim Integrated 16-25
XCH Exchange Accumulator Bytes
Description: Exchanges the upper and lower bytes of the active accumulator .
Status Flags: S
Operation:
Acc .[15:8] ← Acc .[7:0]
Acc .[7:0] ← Acc .[15:8]
Encoding: 15 0
1000 1010 1000 1010
Example(s): ; Acc = 2345h
XCH ; Acc = 4523h
XCHN Exchange Accumulator Nibbles
Description: Exchanges the upper and lower nibbles in the active accumulator byte(s) .
Status Flags: S
Operation:
Acc .[7:4] ← Acc .[3:0]
Acc .[3:0] ← Acc .[7:4]
Acc .[15:12] ← Acc .[11:8]
Acc .[11:8] ← Acc .[15:12]
Encoding: 15 0
1000 1010 0111 1010
Example(s): ; Acc = 2345h
XCHN ; Acc = 3254h
XOR src Logical XOR
Description: Performs a logical-XOR between the active accumulator (Acc or A[AP]) and the specified src data .
For the complete list of src specifiers, reference the MOVE instruction . The PFX[n] register may be
used to supply the high byte of data for 8-bit sources .
Status Flags: S, Z
Operation:
Acc ← Acc XOR src
Encoding: 15 0
f011 1010 ssss ssss
Example(s): ; Acc = 2345h
XOR A[2] ; A[2]=0F0Fh; Acc ← 2C4Ah
Special Notes: The active accumulator (Acc) is not allowed as the src for this operation .