Maxim-integrated MAXQ622 Manual do Utilizador descarregar pdf (Página 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:

Operation:

Acc.[15:8] ← Acc.[7:0]

Acc.[7:0] ← Acc.[15:8]

Encoding:

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:

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:

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:

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.

1 2 ... 230 231 232 233 234 235 236 237 238 239 240 ... 254 255

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