Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 218)

DS4830 User’s Guide
218
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