LPC810M021FN8 datasheet(82/313 Pages) NXP

82 / 313 page

UM10601

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Preliminary user manual

Rev. 1.0 — 7 November 2012

82 of 313

8.1 How to read this chapter

The pin interrupt generator and the pattern match engine are available on all LPC800

parts.

8.2 Features

• Pin interrupts

–

Up to eight pins can be selected from all GPIO pins as edge- or level-sensitive

interrupt requests. Each request creates a separate interrupt in the NVIC.

–

Edge-sensitive interrupt pins can interrupt on rising or falling edges or both.

–

Level-sensitive interrupt pins can be HIGH- or LOW-active.

• Pattern match engine

–

Up to 8 pins can be selected from all GPIO pins to contribute to a boolean

expression. The boolean expression consists of specified levels and/or transitions

on various combinations of these pins.

–

Each bit slice minterm (product term) comprising the specified boolean expression

can generate its own, dedicated interrupt request.

–

Any occurrence of a pattern match can be programmed to also generate an RXEV

notification to the ARM CPU. The RXEV signal can be connected to a pin.

–

Feature can be used, in conjunction with software, to create complex state

machines based on pin inputs.

8.3 Basic configuration

• Pin interrupts:

–

Select up to eight external interrupt pins from all GPIO port pins in the SYSCON

block (Table 32). The pin selection process is the same for pin interrupts and the

pattern match engine. The two features are mutually exclusive.

–

Enable the clock to the pin interrupt register block in the SYSAHBCLKCTRL

–

If you want to use the pin interrupts to wake up the part from deep-sleep mode or

power-down mode, enable the pin interrupt wake-up feature in the STARTERP0

–

Each selected pin interrupt is assigned to one interrupt in the NVIC (interrupts #24

to #31 for pin interrupts 0 to 7).

• Pattern match engine:

–

Select up to eight external pins from all GPIO port pins in the SYSCON block

(Table 32). The pin selection process is the same for pin interrupts and the pattern

match engine. The two features are mutually exclusive.

UM10601

Chapter 8: LPC800 Pin interrupts/pattern match engine

Rev. 1.0 — 7 November 2012

Preliminary user manual

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