LPC2101 Philips Semiconductors (Acquired by NXP), LPC2101 Datasheet - Page 16

• Manufacturer Part Number: LPC2101
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
LPC2101_02_03_1
Preliminary data sheet
6.14.1 Features
6.15.1 Features
6.14 General purpose 16-bit timers/external event counters
6.15 Watchdog timer
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 LPC2101/2102/2103 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.
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.
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– Set HIGH on match.
– Toggle on match.
– Do nothing on match.
Two 16-bit timer/counters with a programmable 16-bit prescaler.
External event counter or timer operation.
Three 16-bit capture channels that can take a snapshot of the timer value when an
input signal transitions. A capture event may also optionally generate an interrupt.
Four 16-bit match registers that allow:
– Continuous operation with optional interrupt generation on match.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
Four external outputs per timer/counter corresponding to match registers, with the
following capabilities:
– Set LOW on match.
– Set HIGH on match.
– Toggle on match.
– Do nothing on match.
Internally resets chip if not periodically reloaded.
Debug mode.
Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be
disabled.
Rev. 01 — 18 January 2006
Single-chip 16-bit/32-bit microcontrollers
LPC2101/2102/2103
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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