LPC2131 datasheet(20/45 Pages) PHILIPS

20 / 45 page

LPC2131_32_34_36_38

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Product data sheet

Rev. 5.1 — 29 July 2011

20 of 45

NXP Semiconductors

LPC2131/32/34/36/38

Single-chip 16/32-bit microcontrollers

– 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.

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.

• Can use either the RTC dedicated 32 kHz oscillator input or clock derived from the

external crystal/oscillator input at XTAL1. Programmable Reference Clock Divider

allows fine adjustment of the RTC.

• Dedicated power supply pin can be connected to a battery or the main 3.3 V.

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