Atmel CAVR-4 사용자 설명서

CAVR-4

Part 2. Compiler reference

_ _hugeflash

Controls the storage of data objects in flash (code) memory space.

The 

_ _hugeflash

 memory attribute places objects in flash (code) memory.

Note that it is preferable to declare flash objects as constant. The 

_ _hugeflash

 

memory attribute is only available for AVR chips with at least 64 Kbytes of flash 
memory.

interrupt

Creates an interrupt function.

The __

interrupt

 keyword specifies interrupt functions. The 

#pragma

 

vector

 

directive can be used for specifying the interrupt vector(s), see #pragma vector, page 
225. An interrupt function must have a 

void

 return type and cannot have any 

parameters.

The following example declares an interrupt function with an interrupt vector with offset 

0x14

 in the 

INTVEC

 segment:

#pragma vector=0x14

_ _interrupt void my_interrupt_handler(void);

An interrupt function cannot be called directly from a C program. It can only be 
executed as a response to an interrupt request. 

It is possible to define an interrupt function without a vector, but then the compiler will 
not generate an entry in the interrupt vector table. For additional information, see 
INTVEC, page 160.

The range of the interrupt vectors depends on the device used. 

The header file 

ioderivative.h

, where 

 corresponds to the selected 

derivative, contains predefined names for the existing interrupt vectors.

For additional information, see Interrupt functions, page 29.

0-0x7FFFFF

 (8 Mbytes)

8 Mbytes

24 bits

Code