Freescale-semiconductor StarCore SC140 Manual do Utilizador descarregar pdf (Página 447)

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CONT

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

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

≤ displacement < 2

,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.

SR[30:27] LF[3:0] Read loop flags to determine active loop.

SR[30:27] LF[3:0] Clear active loop flag if the active loop counter is less than or equal to

one.

_label (displacement)

LC3

$1 $0

$40E4 0000 $00E4 0000

$0000 0014 $0000 0020

1 2 ... 442 443 444 445 446 447 448 449 450 451 452 ... 759 760

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