dsp56000 Freescale Semiconductor, Inc, dsp56000 Datasheet - Page 373

• Manufacturer Part Number: dsp56000
• Description: 24-bit Digital Signal Processor Family Manual
• Manufacturer: Freescale Semiconductor, Inc

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:
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:
The condition codes are not affected by this instruction.
Instruction Format:
Opcode:
MOTOROLA
Jcc
Jcc
0
23
JNN – (R4)
15
LF
xxx
0
:
:
0
DM
14
0
13
T
1
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1
12
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S1
11
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C
Jump Conditionally
C
I1
9
C
;jump to P:(R4) –1 if not normalized
I0
8
C
S
7
a
a
6
L
a
E
5
a
8
U
4
7
CCR
a
N
3
a
a
Z
2
a
V
1
a
C
0
a
a
Jcc
0
a
A - 107