LPC2101_02_03_3

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 03 — 7 October 2008

16 of 32

NXP Semiconductors

LPC2101/02/03

Single-chip 16-bit/32-bit microcontrollers

– Set HIGH on match.

– Toggle on match.

– Do nothing on match.

6.14 General purpose 16-bit timers/external event counters

The Timer/Counter is designed to count cycles of the peripheral clock (PCLK) or an

externally supplied clock and optionally generate interrupts or perform other actions at

specified timer values, based on four match registers. It also includes three capture inputs

to trap the timer value when an input signal transitions, optionally generating an interrupt.

Multiple pins can be selected to perform a single capture or match function, providing an

application with ‘or’ and ‘and’, as well as ‘broadcast’ functions among them.

The LPC2101/02/03 can count external events on one of the capture inputs if the

minimum external pulse is equal or longer than a period of the PCLK. In this configuration,

unused capture lines can be selected as regular timer capture inputs or used as external

interrupts.

6.14.1 Features

input signal transitions. A capture event may also optionally generate an interrupt.

– Continuous operation with optional interrupt generation on match.

– Stop timer on match with optional interrupt generation.

– Reset timer on match with optional interrupt generation.

following capabilities:

– Set LOW on match.

– Set HIGH on match.

– Toggle on match.

– Do nothing on match.

6.15 Watchdog timer

The purpose of the watchdog is to reset the microcontroller within a reasonable amount of

time if it enters an erroneous state. When enabled, the watchdog will generate a system

reset if the user program fails to ‘feed’ (or reload) the watchdog within a predetermined

amount of time.

6.15.1 Features

disabled.