how to enable and disble globle interrupt

Hi vivek,

you can use:

__enable_interrupts(); // global interrupt enable
__disable_interrupts(); // global interrupt disable

to do the job. They were defined in intrinsics.h.

Rgds
aBUGSworstnightmare

vivek kumar said:

SR|=GIE

The C language does not know of the concept of processor registers. It only knws memory location. And SR is no memory location. Actually from a view of a C program, there is no such thing as an SR. (or interrupts and interrupt vector tables)

To overcome this limitation, the compiler provides som additional keywords that trigger a certain behavior. So-called intrinsics.
Or the header files define some macros that convert a behavior that is not expressable in C into an assembly instruction.
In case of GIE, this might be
EINT(); or DINT();
or something like this, which expands to inline assembly code "BIS #4, R2" (or more precisely "BIS @R2,R2", by using the constant generator feature of R2).
If the compiler does not support inline assembly or the problem cannot be solved by a predefined assembly isntruction (like clearing bits on the stack-saved copy of SR, so they will be cleared when leaving an ISR and the SR is restored form stack - required for leaving low power modes), it simply 'knows' these intrinsics as if they were new C keywords and generates the required code.