Interrupts

The PIC18F26/45/46Q10 devices have multiple interrupt sources and an interrupt priority feature that allows most interrupt sources to be assigned a high or low-priority level. The high-priority interrupt vector is at 0008h and the low-priority interrupt vector is at 0018h. A high-priority interrupt event will interrupt a low-priority interrupt that may be in progress.

The registers for controlling interrupt operation are:

It is recommended that the Microchip header files supplied with MPLAB® IDE be used for the symbolic bit names in these registers. This allows the assembler/compiler to automatically take care of the placement of these bits within the specified register.

In general, interrupt sources have three bits to control their operation. They are: