Using Data Formats
2-4
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
Using Data Formats
ADSP-BF53x/56x processors are primarily 16-bit, fixed-point machines.
Most operations assume a two’s-complement number representation,
while others assume unsigned numbers or simple binary strings. Other
instructions support 32-bit integer arithmetic, with further special fea-
tures supporting 8-bit arithmetic and block floating point. For detailed
information about each number format, see
Appendix D, “Numeric
Formats.”
In the ADSP-BF53x/56x processor family arithmetic, signed numbers are
always in two’s-complement format. These processors do not use
signed-magnitude, one’s-complement, binary-coded decimal (BCD), or
excess-n formats.
Binary String
The binary string format is the least complex binary notation; in it, 16 bits
are treated as a bit pattern. Examples of computations using this format
are the logical operations NOT, AND, OR, XOR. These ALU operations
treat their operands as binary strings with no provision for sign bit or
binary point placement.
Unsigned
Unsigned binary numbers may be thought of as positive and having nearly
twice the magnitude of a signed number of the same length. The processor
treats the least significant words of multiple precision numbers as
unsigned numbers.
Содержание ADSP-BF53x Blackfin
Страница 38: ...Conventions xxxviii ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 134: ...System Reset and Powerup 3 18 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 324: ...Instruction Overview 7 20 ADSP BF53x BF56x Blackfin Processor Programming Reference...
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Страница 688: ...Instruction Overview 18 48 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 742: ...Instruction Overview 19 54 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 752: ...Examples 20 10 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 780: ...Product Identification Register 21 28 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 790: ...ADSP BF535 Flags A 10 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 800: ...Performance Monitor Registers B 10 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 994: ...Instructions Listed By Operation Code C 194 ADSP BF53x BF56x Blackfin Processor Programming Reference...
Страница 1042: ...Index I 40 ADSP BF53x BF56x Blackfin Processor Programming Reference...