Interpreting the LPC210X External Interrupt Register

The LPC2101/02/03 contains up to three external interrupt inputs as selectable pin functions. After the pins are combined, external events can be processed into three independent interrupt signals. The external interrupt input can optionally be used to wake the processor from low power mode.

In addition, the 10 capture inputs do not have the option of waking up the device from low-power modes, but can also be used for external interrupts.

There are four registers related to external interrupts

External Interrupt Flag register (EXTINT - 0xE01F C140)

External interrupt flag register

Bit	signal	description	Reset value
0	EINT0	Corresponding to the external interrupt of the pin, this flag is set. Writing 1 clears this bit. If the interrupt is in level-triggered mode, this bit cannot be cleared during level triggering.	0
1	EINT1	Same as EINT0	0
2	EINT2	Same as EINT0	0
7:3		Reserved	NA

Interrupt Wake-up register (INTWAKE - 0xE01F C144)

Interrupt wake-up register

Bit	signal	description	Reset value
0	EXTWAKE0	When set, indicates that the EINT0 interrupt will wake the processor from low power mode	0
1	EXTWAKE1	When set, indicates that the EINT1 interrupt will wake the processor from low power mode	0
2	EXTWAKE2	When set, indicates that the EINT2 interrupt will wake the processor from low power mode	0
14:3		Reserved	NA
15	RTCWAKE	Set to 1 to indicate that RTC interrupt will wake the processor from low power mode

External Interrupt Mode register (EXTMODE - 0xE01F C148)

External Interrupt Mode Register

Bit	signal	description	Reset value
0	EXTMODE0	0 - EINT0 level trigger 1 - EINT0 edge trigger	0
1	EXTMODE1	0 - EINT1 level trigger 1 - EINT1 edge trigger	0
2	EXTMODE2	0 - EINT2 level trigger 1 - EINT2 edge trigger	0
7:3		Reserved	NA

External Interrupt Polarity register (EXTPOLAR - 0xE01F C14C)

External interrupt polarity register

Bit	signal	description	Reset value
0	EXTPOLAR0	0 - EINT0 low or rising edge trigger 1 - EINT0 high level of the latter falling edge trigger	0
1	EXTPOLAR1	0 - EINT1 low or rising edge trigger 1 - EINT1 high level of the latter falling edge trigger	0
2	EXTPOLAR2	0 - EINT2 low or rising edge trigger 1 - EINT2 high level of the latter falling edge trigger	0
7:3		Reserved	NA

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