Datasheet

Product data sheet Rev. 1 — 19 February 2014 38 of 99

NXP Semiconductors

LPC15xx

32-bit ARM Cortex-M3 microcontroller

– The following conditions define an event: a counter match condition, an input (or

output) condition, a combination of a match and/or and input/output condition in a

specified state.

– Selected events can limit, halt, start, or stop a counter.

– Events control state changes, outputs, interrupts, and DMA requests.

– Match register 0 can be used as an automatic limit.

– In bi-directional mode, events can be enabled based on the count direction.

– Match events can be held until another qualifying event occurs.

• State control features:

– A state is defined by events that can take place in the state while the counter is

running.

– A state changes into another state as result of an event.

– Each event can be assigned to one or more states.

– State variable allows sequencing across multiple counter cycles.

• Integrated with an input pre-processing unit (SCTIPU) to combine or delay input

events.

Inputs and outputs on the SCTimer2/PWM and SCTimer3/PWM are configured as follows:

• 3 inputs. Each input selects one of 21 sources from a pin multiplexer.

• 6 outputs (some outputs are connected to multiple locations)

– Three outputs connected to external pins through the switch matrix as movable

functions.

– Three outputs connected to external pins through the switch matrix as fixed-pin

functions.

– Two outputs connected to the SCT IPU to sample or latch input events.

– Four outputs connected to the accompanying large SCT

– Two outputs connected to each ADC trigger input

8.22.5 SCT Input processing unit (SCTIPU)

The SCTIPU allows to block or propagate signals to inputs of the SCT under the control of

an SCT output. Using the SCTIPU in this way, allows signals to be blocked from entering

the SCT inputs for a certain amount of time, for example while they are known to be

invalid.

In addition, the SCTIPU can generate a common signal from several combined input

sources that can be selected on all SCT inputs. Such a mechanism can be useful to

create an abort signal that stops all timers.

8.22.5.1 Features

The SCTIPU pre-processes inputs to the State-Configurable Timers (SCT).

• Four outputs created from a selection of input transitions. Each output can be used as

abort input to the SCTs or for any other application which requires a collection of

multiple SCT inputs to trigger an identical SCT response.