Motorola DSP56000 manual For other source operands Condition codes are not affected

INSTRUCTION DESCRIPTIONS

JCLR

Jump if Bit Clear

JCLR

Restrictions: A JCLR instruction cannot be repeated using the REP instruction.

A JCLR located at LA, LA–1, or LA–2 of the DO loop cannot specify the program control- ler registers SR, SP, SSH, SSL, LA, or LC as its target.

JCLR SSH or JCLR SSL cannot follow an instruction that changes the SP.

Example:

:

JCLR #$5,X:<<$FFF1,$1234 ;go to P:$1234 if bit 5 in SCI SSR is clear

:

Explanation of Example: In this example, program execution is transferred to the

address P:$1234 if bit 5 (PE) of the 8-bit read-only X memory location X:$FFF1 (I/O SCI interface status register) is a zero. If the specified bit is not clear, no jump is taken, and the program counter (PC) 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

For destination operand A or B:

S —Computed according to the definition. See Notes on page A-115.L — Set if data limiting has occurred. See Notes on page A-115.

E — Not affected

U — Not affected

N — Not affected

Z — Not affected

V — Not affected

C — Not affected

For other source operands:

The condition codes are not affected.

MOTOROLA INSTRUCTION SET DETAILS A - 111