SW006012 Microchip Technology, SW006012 Datasheet - Page 202

• Manufacturer Part Number: SW006012
• Description: C COMPILER FOR DSPIC30F FAMILY
• Manufacturer: Microchip Technology
• Type: MPLAB® C30 Compilerr
• Series: PIC24 & DsPICr

Specifications of SW006012

• Supported Families: PIC24, DsPIC30F And DsPIC33F
• Core Architecture: PIC, DsPIC
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC24 MCUs And DsPIC DSCs
• Tool Type: Compiler
• Processor Series: PIC24, dsPIC
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: dsPIC30F
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MPLAB
D.3
D.4
D.5
D.6
DS51284F-page 196
DATA FORMATS
POINTERS
STORAGE CLASSES
STACK USAGE
®
C30 User’s Guide
TABLE D-1:
TABLE D-2:
TABLE D-3:
MPLAB C18 allows the non-ANSI storage class specifiers overlay for variables and
auto or static for function arguments.
MPLAB C30 does not allow these specifiers.
TABLE D-4:
char
int
short long
long
long long
float
double
Note 1:
MPLAB C30
MPLAB C18
Legend: s = sign bit, d = mantissa, e = exponent
Program Memory - Near
Program Memory - Far
Data Memory
Return Addresses
Local Variables
Standard
Data Format
2:
3:
Items on Stack
Memory Type
MPLAB C18 uses its own data format, which is similar to IEEE-754 format, but with
the top nine bits rotated (see Table D-2).
MPLAB C30 uses IEEE-754 format.
See Section 5.5 “Floating Point”.
NUMBER OF BITS USED IN DATA FORMATS
MPLAB
FORMAT
NUMBER OF BITS USED FOR POINTERS
TYPE OF STACK USED
seeeeeee
eeeeeeee
Byte 3
®
C18 FLOATING-POINT VS. MPLAB C30 IEEE-754
1
0
MPLAB
MPLAB
e
sddd dddd
0
16
24
32
32
32
8
-
ddd dddd
MPLAB
hardware
®
software
Byte 2
C18
®
16
24
16
(1)
C18
®
16
16
C18
dddd dddd
dddd dddd
Byte 1
© 2007 Microchip Technology Inc.
MPLAB C30
8
8
MPLAB C30
32 or 64
MPLAB C30
software
software
16
32
64
32
8
-
16
16
16
dddd dddd
dddd dddd
(3)
Byte 0
(2)
0
0