Maxim-integrated DS4830 Optical Microcontroller Manual do Utilizador descarregar pdf (Página 206)

DS4830 User’s Guide

206

NEG Negate Accumulator

Description: Performs a negation (two’s complement) of the active accumulator and returns the result back to

the active accumulator.

Status Flags: S, Z

Operation: Acc  ~Acc + 1

Encoding: 15 0

1000

1010

1001

1010

Example(s): ; Acc = FEEDh, S=1, Z=0

NEG ; Acc = 0113h, S=0, Z=0

OR src Logical OR

Description: Performs a logical-OR between the active accumulator (Acc or A[AP]) and the specified src data.

For the complete list of src specifiers, reference the MOVE instruction.

Because the source is

limited to 8 bits, the PFX[n] register is used to supply the high-byte of data for 16 bit sources.

Status Flags: S, Z

Operation: Acc  Acc OR src

Encoding: 15 0

f010

1010

ssss

Example(s): ; Acc = 2345h for each example

OR A[3] ; A[3]= 0F0Fh  Acc = 2F4Fh

OR #1133h ; MOVE PFX[0], #11h (smart-prefixing)

; OR #33h  Acc = 3377h

Special Notes: The active accumulator (Acc) is not allowed as the src for this operation.

OR Acc.<b> Logical OR Carry Flag with Accumulator bit

Description: Performs a logical-OR between the Carry (C) status flag and a specified bit of the active

accumulator (Acc.<b>) and returns the result to the Carry.

Status Flags: C

Operation: C  C OR Acc.<b>

Encoding: 15 0

1010

bbbb

1010

Example(s): ; Acc = 2345h, C=0 at start

OR Acc.1 ; Acc.1=0  C=0

OR Acc.2 ; Acc.2=1  C=1

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Maxim-integrated DS4830 Optical Microcontroller Manual do Utilizador Página 206