LPC810M021FN8 datasheet(83/313 Pages) NXP

83 / 313 page

UM10601

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Preliminary user manual

Rev. 1.0 — 7 November 2012

83 of 313

NXP Semiconductors

UM10601

Chapter 8: LPC800 Pin interrupts/pattern match engine

–

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

–

Each bit slice of the pattern match engine is assigned to one interrupt in the NVIC

(interrupts #24 to #31 for slices 0 to 7).

–

The combined interrupt from all slices or slice combinations can be connected to

the ARM RXEV request and to pin function GPIO_INT_BMAT through the switch matrix

movable function register (PINASSIGN8,

Table 104).

8.3.1 Configure pins as pin interrupts or as inputs to the pattern match

engine

Follow these steps to configure pins as pin interrupts:

1. Determine the pins that serve as pin interrupts on the LPC800 package. See the data

sheet for determining the GPIO port pin number associated with the package pin.

2. For each pin interrupt, program the GPIO port pin number into one of the eight

PINTSEL registers in the SYSCON block.

Remark:

The port pin number serves to identify the pin to the PINTSEL register. Any

function, including GPIO, can be assigned to this pin through the switch matrix.

3. Enable each pin interrupt in the NVIC.

Once the pin interrupts or pattern match inputs are configured, you can set up the pin

interrupt detection levels or the pattern match boolean expression.

See Section 4.6.27 “Pin interrupt select registers” in the SYSCON block for the PINTSEL

registers.

8.4 Pin description

The inputs to the pin interrupt and pattern match engine are determined by the pin

interrupt select registers in the SYSCON block. See Section 8.3.1.

The pattern match engine output is assigned to an external pin through the switch matrix.

See Section 9.3.1 “Connect an internal signal to a package pin” for the steps that you

need to follow to assign the GPIO pattern match function to a pin on the LPC800 package.

8.5 General description

Pins with configurable functions can serve as external interrupts or inputs to the pattern

match engine. You can configure up to eight pins total using the PINTSEL registers in the

SYSCON block for these features.

Table 78.

SCT pin description

Function

Direction Pin

Description

SWM register

Reference

GPIO_INT_BMAT

any

GPIO pattern match

output

PINASSIGN8

Table 104

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