LPC1500 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
LPC1500 Datasheet PDF : 107 Pages
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NXP Semiconductors
LPC15xx
32-bit ARM Cortex-M3 microcontroller
• When the ADC is accurately calibrated, the internal voltage reference can be used to
measure the power supply voltage. This requires calibration by recording the ADC
code of the internal voltage reference at different power supply levels yielding a
different ADC code value for each supply voltage level. In a particular application, the
internal voltage reference can be measured and the actual power supply voltage can
be determined from the stored calibration values. The calibration values can be stored
in the EEPROM for easy access.
After power-up, the internal voltage reference must be allowed to settle to its stable value
before it can be used as an ADC reference voltage input.
For an accurate measurement of the internal voltage reference by the ADC, the ADC must
be configured in single-channel burst mode. The last value of a nine-conversion (or more)
burst provides an accurate result.
8.29 Multi-Rate Timer (MRT)
The Multi-Rate Timer (MRT) provides a repetitive interrupt timer with four channels. Each
channel can be programmed with an independent time interval, and each channel
operates independently from the other channels.
8.29.1 Features
• 24-bit interrupt timer
• Four channels independently counting down from individually set values
• Repeat and one-shot interrupt modes
8.30 Windowed WatchDog Timer (WWDT)
The watchdog timer resets the controller if software fails to periodically service it within a
programmable time window.
8.30.1 Features
• Internally resets chip if not periodically reloaded during the programmable time-out
period.
• Optional windowed operation requires reload to occur between a minimum and
maximum time period, both programmable.
• Optional warning interrupt can be generated at a programmable time prior to
watchdog time-out.
• Enabled by software but requires a hardware reset or a watchdog reset/interrupt to be
disabled.
• Incorrect feed sequence causes reset or interrupt if enabled.
• Flag to indicate watchdog reset.
• Programmable 24-bit timer with internal prescaler.
• Selectable time period from (Tcy(WDCLK) 256 4) to (Tcy(WDCLK) 224 4) in
multiples of Tcy(WDCLK) 4.
• The WWDT is clocked by the dedicated watchdog oscillator (WDOsc) running at a
fixed frequency.
LPC15XX
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 29 April 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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