Jsset - Motorola DSP56000 Manual

JSSET

th
n bit. All address register indirect addressing modes may be used to reference the
source operand S. Absolute short and I/O short addressing modes may also be used.
Restrictions: A JSSET instruction used within a DO loop cannot specify the loop
address (LA) as its target.
A JSSET located at LA, LA–1, or LA–2 of a DO loop, cannot specify the program control-
ler registers SR, SP, SSH, SSL, LA, or LC as its target.
JSSET SSH or JSSET SSL cannot follow an instruction that changes the SP.
A JSSET instruction cannot be repeated using the REP instruction.
Example:
:
JSSET #$17,Y:<$3F,$100
:
Explanation of Example: In this example, program execution is transferred to the sub-
routine at absolute address P:$0100 in program memory if bit 23 of Y memory location
Y:$003F is a one. If the specified bit is not set, no jump is taken and the program counter
(PC) is incremented by 1.
Condition Codes:
15 14 13
LF DM
For destination operand A or B:
S —Computed according to the definition. See Notes on page A-143.
L — Set if data limiting has occurred. See Notes on page A-143.
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 DESCRIPTIONS
Jump to Subroutine if Bit Set
;go to sub. at P:$0100 if bit 23 in Y:$3F is set
12 11 10 9
T ** S1 S0 I1
MR
INSTRUCTION SET DETAILS
8 7 6 5 4
I0 S L E U
CCR
JSSET
3 2 1 0
N Z V C
A - 139