Motorola 24-Bit Digital Signal Processor, DSP56000 manual Decrement by One, Dec D

INSTRUCTION DESCRIPTIONS

DEC	Decrement by One
Operation:	Assembler Syntax:
D–1 ➞ D	DEC D

DEC

Description: Decrement by one the specified operand and store the result in the destina- tion accumulator. One is subtracted from the LSB of D.

Example:
	:
DEC	A	;Decrement the content of A accumulator by one
	:

Explanation of Example: One is subtracted from the content of the A accumulator.

Condition Codes:

15	14	13	12	11		10	9		8	7	6	5	4	3	2	1		0
LF	DM	T	**		S1	S0		I1	I0	S	L	E	U	N	Z		V	C
				MR									CCR

L — Set if overflow has occurred in result. Not affected otherwise

E — Set if the signed integer portion of result is in use

U— Set if result is unnormalized

N — Set if bit 55 of result is set

Z — Set if result equals zero

V — Set if overflow has occurred in result

C — Set if a borrow occurs from bit 55 of result

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