Datasheet

Product data sheet Rev. 1 — 1 October 2014 20 of 81

NXP Semiconductors

LPC82x

32-bit ARM Cortex-M0+ microcontroller

– Four inputs. Each input is configurable through an input multiplexer to use one of

four external pins (connected through the switch matrix) or one of four internal

sources. The maximum input signal frequency is 25 MHz.

– Six outputs. Connected to pins through the switch matrix.

• Counter/timer features:

– Each SCTimer is configurable as two 16-bit counters or one 32-bit counter.

– Counters can be clocked by the system clock or selected input.

– Configurable as up counters or up-down counters.

– Configurable number of match and capture registers. Up to eight match and

capture registers total.

– Upon match create the following events: interrupt; stop, limit, halt the timer or

change counting direction; toggle outputs.

– Counter value can be loaded into capture register triggered by a match or

input/output toggle.

• PWM features:

– Counters can be used with match registers to toggle outputs and create

time-proportioned PWM signals.

– Up to six single-edge or dual-edge PWM outputs with independent duty cycle and

common PWM cycle length.

• Event creation features:

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

output) condition such as a rising or falling edge or level, a combination of match

and/or input/output condition.

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

– Events trigger state changes, output toggles, interrupts, and DMA transactions.

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

– In bidirectional 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 happen in the state while the counter is

running.

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

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

– State variable allows sequencing across multiple counter cycles.

• One SCTimer match output can be selected as ADC hardware trigger input.

8.16.2 SCTimer/PWM input MUX (INPUT MUX)

Each input of the SCTimer/PWM is connected to a programmable multiplexer which

allows to connect one of multiple internal or external sources to the input. The available

sources are the same for each SCTimer/PWM input and can be selected from four pins

configured through the switch matrix, the ADC threshold compare interrupt, the

comparator output, and the ARM core signals ARM_TXEV and DEBUG_HALTED.