LPC2290 NXP Semiconductors, LPC2290 Datasheet - Page 21

• Manufacturer Part Number: LPC2290
• Description: The LPC2290 microcontroller is based on a 16/32-bit ARM7TDMI-S CPU with real-timeemulation and embedded trace support
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2290_3
Product data sheet
6.14.2 Timer features available in LPC2290/01 only
6.15.1 Features
6.16.1 Features
6.15 Watchdog timer
6.16 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).
•
•
•
•
•
•
•
•
•
•
•
•
•
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.
Timers can count cycles of the externally supplied clock providing external event
counting functionality
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.
cy(PCLK)
4.
Rev. 03 — 16 November 2006
16/32-bit ARM microcontroller with external memory interface
cy(PCLK)
256
4) to (T
cy(PCLK)
2
32
LPC2290
© NXP B.V. 2006. All rights reserved.
4) in multiples of
21 of 41