LPC2290 datasheet(21/41 Pages) NXP

21 / 41 page

LPC2290_3

Product data sheet

Rev. 03 — 16 November 2006

21 of 41

NXP Semiconductors

LPC2290

16/32-bit ARM microcontroller with external memory interface

• Four external outputs per timer corresponding to match registers, with the following

capabilities:

– Set LOW on match.

– Set HIGH on match.

– Toggle on match.

– Do nothing on match.

6.14.2 Timer features available in LPC2290/01 only

• Timers can count cycles of the externally supplied clock providing external event

counting functionality

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

• 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.

• Incorrect/incomplete feed sequence causes reset/interrupt if enabled.

• Flag to indicate watchdog reset.

• Programmable 32-bit timer with internal pre-scaler.

• Selectable time period from (Tcy(PCLK) × 256 × 4) to (Tcy(PCLK) × 232 × 4) in multiples of

Tcy(PCLK) × 4.

6.16 Real-time clock

The Real-Time Clock (RTC) is designed to provide a set of counters to measure time

when normal or idle operating mode is selected. The RTC has been designed to use little

power, making it suitable for battery powered systems where the CPU is not running

continuously (Idle mode).

6.16.1 Features

• Measures the passage of time to maintain a calendar and clock.

• Ultra-low power design to support battery powered systems.

• Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and Day

of Year.

• Programmable Reference Clock Divider allows adjustment of the RTC to match

various crystal frequencies.

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