SW500009 Microchip Technology, SW500009 Datasheet - Page 60

• Manufacturer Part Number: SW500009
• Description: HI-TECH FOR DSPIC/PIC24
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC24 & DsPICr

Specifications of SW500009

• Supported Families: PIC24
• Core Architecture: PIC, DsPIC
• Software Edition: Standard
• Kit Contents: Software And Docs
• Tool Type: Compiler
• Mcu Supported Families: PIC24 MCUs And DsPIC DSCs
• Lead Free Status / RoHS Status: Not applicable / RoHS Compliant
• For Use With/related Products: DSPIC3X/PIC24
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 025; 778-1003; 778-1003

Supported Data Types and Variables
of these types. Floating point types are always signed and the unsigned keyword is illegal when
specifying a floating point type. Types declared as long double will use the same format as types
declared as double.
doubles can be selected via the –double=fast32 command line option. Although selecting this offers
an improvement in speed when doing calculations on 32-bit doubles, this comes at a cost of code
size.
3.4.7 Structures and Unions
HI-TECH PICC STD supports struct and union types of any size from one byte upwards. Struc-
tures and unions only differ in the memory offset applied for each member. The members of struc-
tures and unions may not be objects of type bit, but bit-fields are fully supported.
structures and unions are fully supported.
3.4.7.1 Bit-fields in Structures
HI-TECH PICC STD fully supports bit-fields in structures.
bit of the word in which it will be stored. When a bit-field is declared, it is allocated within the
current 8-bit unit if it will fit, otherwise a new byte is allocated within the structure. Bit-fields can
never cross the boundary between 8-bit allocation units. For example, the declaration:
46
Format
32-bit
24-bit
Variables may be declared using the float and double keywords, respectively, to hold values
For High-End processors there is a fast implementation available for 32-bit doubles. Fast 32-bit
Structures and unions may be passed freely as function arguments and return values. Pointers to
Bit-fields are always allocated within 8-bit words. The first bit defined will be the least significant
struct {
} foo;
Number
7DA6B69Bh
42123Ah
unsigned
unsigned
unsigned
Table 3.4: Floating-point format example IEEE 754
biased expo-
nent
11111011b
10000100b
(251)
(132)
lo : 1;
dummy : 6;
hi : 1;
1.01001101011011010011011b
1.001001000111010b
(1.302447676659)
(1.142395019531)
1.mantissa
C Language Features
2.77000e+37
36.557
decimal