LPC2119 Philips Semiconductors (Acquired by NXP), LPC2119 Datasheet - Page 19

• Manufacturer Part Number: LPC2119
• Description: Single-chip 16/32-bit Microcontrollers; 128/256 KB Isp/iap Flash With 10-bit ADC And CANthe LPC2119/LPC2129 Are Based on a 16/32 Bit ARM7TDMI-STM Cpu With Real-time Emulation And Embedded Trace Support, Together With 128/256 Kilobytes (kB) of Embedde
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
9397 750 12806
Preliminary data
6.17.1 Features
6.18.1 Features
6.17 Watchdog timer
6.18 Real time clock
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.
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).
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Four external outputs per timer corresponding to match registers, with the following
capabilities:
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 (t
t
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.
– Stop timer on match with optional interrupt generation.
– Reset timer on match with optional interrupt generation.
– Set LOW on match.
– Set HIGH on match.
– Toggle on match.
– Do nothing on match.
pclk
4.
Rev. 02 — 02 February 2004
pclk
256
4) to (t
Single-chip 16/32-bit microcontrollers
LPC2119/LPC2129
pclk
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
2
32
4) in multiples of
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