CC78K4 datasheet(367/523 Pages) NEC

номер детали	CC78K4

подробное описание детали	CC78K4 Ver.2.30 or Later, C Compiler Language

PDF	523 Pages

Scroll/Zoom	100%

производитель	NEC [NEC]

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CHAPTER 11 EXTENDED FUNCTIONS

User’s Manual U15556EJ1V0UM

367

(18) Bit field declaration

Bit Field Declaration

Bit field declaration

(1) Extension of type specifier

FUNCTION

•

The bit field of unsigned char type is not allocated straddling over a byte boundary.

•

The bit field of unsigned int type is not allocated straddling over a word boundary, but can be allocated

straddling over a byte boundary.

•

The bit fields of the same type are allocated in the same byte units (or word units). If the types are different,

the bit fields are allocated in different byte units (or word units).

EFFECT

•

The memory can be saved, the object code can be shortened, and the execution speed can be improved.

USAGE

•

As a bit field type specified, unsigned char type can be specified in addition to unsigned int type. Declare as

follows.

struct

tag-name {

unsigned char

field-name: bit-width;

unsigned char

field-name: bit-width;

unsigned int

field-name: bit-width;

};

EXAMPLE

struct

tagname {

unsigned char A:1;

unsigned char B:1;

unsigned int C:2;

unsigned int D:1;

CC78K4 датащи(PDF) 367 Page - NEC