Analog Devices ADSP-BF53x Blackfin Reference page 384

Instruction Overview
All moves from 40-bit Accumulators to 32-bit D-registers support
saturation.
Options
The Accumulator to Data Register Move instruction supports the options
listed in the table below.
Table 9-1. Accumulator to Data Register Move
Option Accumulator Copy Formatting
Default Signed fraction. Copy Accumulator 9.31 format to register 1.31 format. Saturate
results between minimum -1 and maximum 1-2
Signed integer. Copy Accumulator 40.0 format to register 32.0 format. Saturate
results between minimum -2
In either case, the resulting hexadecimal range is minimum 0x8000 0000 through
maximum 0x7FFF FFFF.
The Accumulator is unaffected by extraction.
(FU) Unsigned fraction. Copy Accumulator 8.32 format to register 0.32 format. Saturate
results between minimum 0 and maximum 1-2
Unsigned integer. Copy Accumulator 40.0 format to register 32.0 format. Saturate
results between minimum 0 and maximum 2
In either case, the resulting hexadecimal range is minimum 0x0000 0000 through
maximum 0xFFFF FFFF.
The Accumulator is unaffected by extraction.
9-4 ADSP-BF53x/BF56x Blackfin Processor Programming Reference
-31
.
31 31
and maximum 2 -1.
-32
.
32
-1.