LPC2194 datasheet(19/33 Pages) PHILIPS

19 / 33 page

Philips Semiconductors

LPC2194

Single-chip 16/32-bit microcontrollers

Preliminary data

Rev. 01 — 06 February 2004

19 of 33

9397 750 12757

• Four 32-bit capture channels per timer that can take a snapshot of the timer value

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

interrupt.

• Four 32-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 corresponding to match registers, with the following

capabilities:

– Set LOW on match.

– Set HIGH on match.

– Toggle on match.

– Do nothing on match.

6.17 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.

6.17.1

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 (tpclk × 256 × 4) to (tpclk × 232 × 4) in multiples of

tpclk × 4.

6.18 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).

6.18.1

Features

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

• Ultra Low Power design to support battery powered systems.

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