LPC55S6X datasheet(59/128 Pages) NXP

59 / 128 page

LPC55S6x

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Product data sheet

Rev. 1.9 — 10 February 2020

59 of 128

NXP Semiconductors

LPC55S6x

32-bit ARM Cortex-M33 microcontroller

7.28.1 Features

• A 32-bit timer/counter with a programmable 32-bit prescaler.

• Counter or timer operation.

• Up to four 32-bit 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 32-bit match registers 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 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.

• Up to two match registers can be used to generate timed DMA requests.

• Up to 4 match registers can be configured for PWM operation, allowing up to 3 single

edged controlled PWM outputs.WM mode using up to three match channels for PWM

output.

7.28.2 SCTimer/PWM subsystem

The SCTimer/PWM is a flexible timer module capable of creating complex PWM

waveforms and performing other advanced timing and control operations with minimal or

no CPU intervention.

The SCTimer/PWM can operate as a single 32-bit counter or as two independent, 16-bit

counters in uni-directional or bi-directional mode. It supports a selection of match registers

against which the count value can be compared, and capture registers where the current

count value can be recorded when some pre-defined condition is detected.

The SCTimer/PWM module supports multiple separate events that can be defined by the

user based on some combination of parameters including a match on one of the match

registers, and/or a transition on one of the SCTimer/PWM inputs or outputs, the direction

of count, and other factors.

Every action that the SCTimer/PWM block can perform occurs in direct response to one of

these user-defined events without any software overhead. Any event can be enabled to:

• Start, stop, or halt the counter.

• Limit the counter which means to clear the counter in unidirectional mode or change

its direction in bi-directional mode.

• Set, clear, or toggle any SCTimer/PWM output.

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