Motorola DSP56000, 24-Bit Digital Signal Processor manual 0 0 1 1 1 C C a a a a A a a a a a

INSTRUCTION DESCRIPTIONS

Jcc

Jump Conditionally

Jcc

Restrictions: A Jcc instruction used within a DO loop cannot begin at the address LA within that DO loop.

A Jcc instruction cannot be repeated using the REP instruction.

Example:

:

JNN – (R4);jump to P:(R4) –1 if not normalized

:

Explanation of Example: In this example, program execution is transferred to the address P:(R4)–1 if the result is not normalized. Note that the contents of address regis- ter R4 are predecremented by 1, and the resulting address is then loaded into the pro- gram counter (PC) if the specified condition is true. If the specified condition is not true, no jump is taken, and the program counter is incremented by one.

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

The condition codes are not affected by this instruction.

Instruction Format:

Jcc xxx

Opcode:

	23	16	15	8	7	0
0 0 0 0 1 1 1 0			C C C C a a a a		a a a a a a a a

MOTOROLA INSTRUCTION SET DETAILS A - 107