Maxim Integrated DS4830 Optical Microcontroller - Manual (Page 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 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. 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.) and returns the result to the Carry.
Status Flags:
C
Operation:
C  C OR Acc.
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