Motorola DSP56800 Manual page 369

NOT
Operation:
D → D
D[31:16] → D[31:16]
where the bar over the D (D) denotes the logical NOT operator
Description: Take the one's-complement of the destination operand (D) and store the result in the destination. This
instruction is a 16-bit operation. If the destination is a 36-bit accumulator, the one's-complement is
performed on bits 31–16 of the accumulator. The remaining bits of the destination accumulator are not
affected.
Example:
NOT A
Before Execution
5 1234
A2 A1
SR
0300
Explanation of Example:
Prior to execution, the 36-bit A accumulator contains the value $5:1234:5678. The NOT A instruction
takes the one's-complement of bits 31–16 of the A accumulator (A1) and stores the result back in the
A1 register. The remaining A accumulator bits are not affected.
Condition Codes Affected:
15 14
LF *
See Section 3.6.5, "16-Bit Destinations," on page 3-35 for cases with X0, Y0, or Y1 as D.
See Section 3.6.2, "36-Bit Destinations—CC Bit Set," on page 3-34 and Section 3.6.4, "20-Bit Desti-
nations—CC Bit Set," on page 3-34 for the case when the CC bit is set.
Instruction Fields:
Operation
NOT
Timing: 2 oscillator clock cycles
Memory: 1 program word
Logical Complement
(no parallel move)
(no parallel move)
A,X:(R2)+
5678
A0
MR
13 12 11 10 9
* * * * I1
N — Set if bit 31 of A or B result is set
Z — Set if bits 31–16 of A or B result are zero
V — Always cleared
Operands C
FDD 2
Instruction Set Details
Assembler Syntax:
NOT D
NOT D
; save A1 and take the 1's complement of A1
After Execution
5 EDCB
A2 A1
SR
0300
CCR
8 7 6 5 4
I0 SZ L E U
W
1 One's-complement (bit-wise negation)
NOT
(no parallel move)
(no parallel move)
5678
A0
3 2 1 0
N Z V C
Comments
A-139