LPC540xx
NXP Semiconductors
32-bit ARM Cortex-M4 microcontroller
– Toggle on match.
– Do nothing on match.
• Up to two match registers can be used to generate timed DMA requests.
• 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.
• Up to four match registers can be configured for PWM operation, allowing up to three
single edged controlled PWM outputs. (The number of match outputs for each timer
that are actually available on device pins may vary by device.)
7.16.2 SCTimer/PWM
The SCTimer/PWM allows a wide variety of timing, counting, output modulation, and input
capture operations. The inputs and outputs of the SCTimer/PWM are shared with the
capture and match inputs/outputs of the 32-bit general-purpose counter/timers.
The SCTimer/PWM can be configured as two 16-bit counters or a unified 32-bit counter. In
the two-counter case, in addition to the counter value the following operational elements
are independent for each half:
• State variable.
• Limit, halt, stop, and start conditions.
• Values of Match/Capture registers, plus reload or capture control values.
In the two-counter case, the following operational elements are global to the
SCTimer/PWM, but the last three can use match conditions from either counter:
• Clock selection
• Inputs
• Events
• Outputs
• Interrupts
7.16.2.1 Features
• Two 16-bit counters or one 32-bit counter.
• Counter(s) clocked by bus clock or selected input.
• Up counter(s) or up-down counter(s).
• State variable allows sequencing across multiple counter cycles.
• Event combines input or output condition and/or counter match in a specified state.
• Events control outputs, interrupts, and the SCTimer/PWM states.
– 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.
• Selected event(s) can limit, halt, start, or stop a counter.
• Supports:
LPC540xx
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© NXP Semiconductors N.V. 2018. All rights reserved.
Product data sheet
Rev. 1.8 — 22 June 2018
79 of 168
NXP [ NXP ]
