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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
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
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