The pins denoted in the table below can be configured to operate as interrupt-on-change (IOC) pins for this device. An interrupt can be generated by detecting a signal that has either a rising edge or a falling edge. Any individual PORT pin, or combination of PORT pins, can be configured to generate an interrupt.
| Device | PORTA | PORTB | PORTC | PORTD | PORTE |
|---|---|---|---|---|---|
| 28-pin devices | ● | ● | ● | ● |
Important: If MCLRE =
1 or LVP = 1, the MCLR pin
port functionality is disabled and IOC on that pin is not available.The interrupt-on-change module has the following features:
- Interrupt-on-change enable (Host Switch)
- Individual pin configuration
- Rising and falling edge detection
- Individual pin interrupt flags
The following figure is a block diagram of the IOC module.
Figure 1. Interrupt-on-Change Block Diagram
(PORTA Example)
