Cont, Continue to the next loop iteration (agu), Operation assembler syntax – Freescale Semiconductor StarCore SC140 User Manual
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SC140 DSP Core Reference Manual
A-133
CONT
Continue to the Next Loop Iteration (AGU)
CONT
Description
Status and Conditions that Affect Instruction
Status and Conditions Changed by Instruction
Example
cont _label
Loop count 3 (LC3) is 1, so loop count is decremented to 0, loop flag 3 (SR26) is cleared, and program
continues at _label, address $0000 0020.
Operation
Assembler Syntax
If LCn
> 1,
then SAn
→ PC, LCn-1 → LCn
else PC + displacement
→ PC
0
→ LFn,
0
→ LCn
CONT label
CONT label
Continues the active loop n from the start address of the loop (SAn) if its loop counter (LCn) is greater than
one. Otherwise, it clears the active loop flag (LFn) and branches to an address determined by a 16-bit
signed displacement [–2
16
≤ displacement < 2
16
,W
] added to the PC. In either case, the active loop counter
is decremented by one. Some programming rules apply to the use of this instruction. If no loops are
enabled, this instruction is undefined.
Register Address
Bit Name
Description
SR[30:27]
LF[3:0]
Read loop flags to determine active loop.
Register Address
Bit Name
Description
SR[30:27]
LF[3:0]
Clear active loop flag if the active loop counter is less than or equal to
one.
Register/Memory Address
Before
After
_label (displacement)
$C
LC3
$1
$0
SR
$40E4 0000
$00E4 0000
PC
$0000 0014
$0000 0020