Datasheet
LPC111X All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 9.2 — 26 March 2014 51 of 127
NXP Semiconductors
LPC1110/11/12/13/14/15
32-bit ARM Cortex-M0 microcontroller
• Optional conversion on transition of input pin or timer match signal.
• Individual result registers for each ADC channel to reduce interrupt overhead.
7.12 General purpose external event counter/timers
The LPC1110/11/12/13/14/15 include two 32-bit counter/timers and two 16-bit
counter/timers. The counter/timer is designed to count cycles of the system derived clock.
It can optionally generate interrupts or perform other actions at specified timer values,
based on four match registers. Each counter/timer also includes up to two capture inputs
to trap the timer value when an input signal transitions, optionally generating an interrupt.
7.12.1 Features
• A 32-bit/16-bit timer/counter with a programmable 32-bit/16-bit prescaler.
• Counter or timer operation.
• Up to two capture channels per timer, that can take a snapshot of the timer value
when an input signal transitions. A capture event may also generate an interrupt.
• The timer and prescaler may be configured to be cleared on a designated capture
event. This feature permits easy pulse width measurement by clearing the timer on
the leading edge of an input pulse and capturing the timer value on the trailing edge.
• Four match registers per timer 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.
• Up to four external outputs corresponding to match registers, with the following
capabilities:
– Set LOW on match.
– Set HIGH on match.
– Toggle on match.
– Do nothing on match.
7.13 System tick timer
The ARM Cortex-M0 includes a system tick timer (SYSTICK) that is intended to generate
a dedicated SYSTICK exception at a fixed time interval (typically 10 ms).
7.14 Watchdog timer (LPC1100 series, LPC111x/101/201/301)
Remark: The watchdog timer without windowed features is available on parts
LPC111x/101/201/301.
The purpose of the watchdog is to reset the microcontroller within a selectable time
period.
7.14.1 Features
• Internally resets chip if not periodically reloaded.
• Debug mode.