Subtract Immediate - Analog Devices ADSP-BF53x Blackfin Reference

Instruction Overview

Subtract Immediate

General Form
register -= constant
Syntax
Ireg -= 2 ;
increment (a) */
Ireg -= 4 ;
Syntax Terminology
:
Ireg I3–0
Instruction Length
In the syntax, comment (a) identifies 16-bit instruction length.
Functional Description
The Subtract Immediate instruction subtracts a constant value from an
Index register without saturation.
The instruction versions that explicitly modify
optional circular buffering. See
on page 1-21
disable it prior to issuing this instruction by clearing the Length
Register (
15-90 ADSP-BF53x/BF56x Blackfin Processor Programming Reference
/* decrement Ireg by 2, half-word address pointer
/* word address pointer decrement (a) */
for more details. Unless circular buffering is desired,
) corresponding to the
Lreg
Ireg
"Automatic Circular Addressing"
used in this instruction.
Ireg
support