SW500010 Microchip Technology, SW500010 Datasheet - Page 218

• Manufacturer Part Number: SW500010
• Description: HI-TECH C PRO FOR PIC10/12/16
• Manufacturer: Microchip Technology
• Type: Compilerr
• Series: PIC10/12/16r

Specifications of SW500010

• Supported Families: PIC10, PIC12, PIC16
• Core Architecture: PIC
• Software Edition: Professional
• Kit Contents: Software And Docs
• Mcu Supported Families: PIC10/12/16
• Tool Type: Compiler
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• For Use With/related Products: PIC10, PIC12, PIC14, PIC16, PIC16E
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 019P; 778-1006; 778-1006

DI, EI
Synopsis
Description
The di() and ei() routines disable and re-enable interrupts respectively. These are implemented as
macros defined in PIC.h. The example shows the use of ei() and di() around access to a long variable
that is modified during an interrupt. If this was not done, it would be possible to return an incorrect
value, if the interrupt occurred between accesses to successive words of the count value.
Example
218
#include <htc.h>
void ei (void)
void di (void)
#include <htc.h>
long count;
void
interrupt tick (void)
{
}
long
getticks (void)
{
}
count++;
long val;
di();
val = count;
ei();
return val;
/ * Disable interrupts around access
to count, to ensure consistency. * /
Library Functions