DS40244 データシートの表示（PDF） - Microchip Technology

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DS40244

Microchip Development Systems Ordering Guide

Microchip Technology 

Development Systems Ordering Guide

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dsPIC30F Math Library

The dsPIC30F Math Library is the compiled version of

the math library that is distributed with the highly

optimized, ANSI-compliant dsPIC30F MPLAB® C30

C Compiler (SW006012). It contains advanced single

and double-precision, floating-point arithmetic and

trigonometric functions from the standard ‘C’ header

file <math.h>. The library delivers small program code

size and data size, reduced cycles and high accuracy.

Features

• The math library is callable from either MPLAB C30

or dsPIC30F Assembly language.

• The functions are IEEE-754 compliant, with signed

zero, signed infinity, NaN (Not a Number) and

denormal support and operate in the

“Round-to-Nearest” mode.

• Compatible with MPLAB ASM30 and MPLAB

LINK30, which are available at no charge from

Microchip’s web site.

• Total library memory usage(1,2):

- Code size: 5250 bytes

- Data size: 4 bytes

dsPIC® DSC Math Library Function and Performance

Function Group

Performance

Function (Cycles)(1,2,3,4)

Basic Floating Point

Addition

122

Subtraction

124

Multiplication

109

Division

361

Remainder

385

Trigonometric and

acos

478

Hyperbolic

asic

363

atan

696

atan2

3206

cos

3249

sin

2238

tan

2460

cosh

1049

sinh

525

tanh

338

Logarithmic and

exp

530

Exponential

frexp

39

Idexp

44

log

2889

log10

3007

Power Functions

pow

2134

sqrt

493

Rounding Functions

ceil

94

floor

51

Absolute Value Function fabs

6

Modular Arithmetic

modf

151

Functions

fmod

129

Note 1: Results are based on using the dsPIC30F

MPLAB® C30 Compiler (SW006012) version 1.20.

2: Maximum “Memory Usage” when all functions in the

library are loaded. Most applications will use less.

3: All performance statistics represented here are for

32-bit IEEE754 floating-point input and output data

types.

4: Performance (in instruction cycles) listed here

represent an average number of instruction cycles

required to perform the floating-point operation.

Ordering Information:

SW300020 dsPIC30F Math Library (Free download: www.microchip.com)

DS51443 “dsPIC30F Math Library Product Overview” (Available at: www.microchip.com)

DS30177T-page 12

© 2005 Microchip Technology Inc.

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