LPC2129 datasheet(20/34 Pages) PHILIPS

20 / 34 page

Philips Semiconductors

LPC2119/LPC2129

Single-chip 16/32-bit microcontrollers

Product data

Rev. 03 — 22 December 2004

20 of 34

9397 750 13146

– 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.

• 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.

6.19 Pulse width modulator

The PWM is based on the standard Timer block and inherits all of its features, although

only the PWM function is pinned out on the LPC2119/LPC2129. The Timer is designed

to count cycles of the peripheral clock (PCLK) and optionally generate interrupts or

perform other actions when speciﬁed timer values occur, based on seven match

registers. The PWM function is also based on match register events.

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