Objective:

In this tutorial we will discuss how to configure and use the LPC1768 external interrupts(EINT0-EINT3).
At the end of tutorial we will see how to use the exploreembedded external interrupt library.

EINTx Pins

LPC1768 has four external interrupts EINT0-EINT3. As LPC1768 pins are multi functional, these four interrupts are available on multiple pins. Below table shows mapping of EINTx pins.

Port Pin Ext Interrupt PINSEL_FUNC_0 PINSEL_FUNC_1 PINSEL_FUNC_2 PINSEL_FUNC_3
P2.10 EINT0 GPIO TXD0 ADC0[7]
P2.11 EINT1 GPIO RXD0 ADC0[6]
P2_12 EINT2 GPIO PWM1[1] TXD1
P2.13 EINT3 GPIO PWM1[2] RXD1