UM10462 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2016. All rights reserved.
User manual Rev. 5.5 — 21 December 2016 333 of 523
15.1 How to read this chapter
CT16B0/1 are available on all LPC11U3x/2x/1x parts. The number of capture inputs
depends on package size. See Chapter 8
.
15.2 Basic configuration
The CT16B0/1 counter/timers are configured through the following registers:
• Pins: The CT16B0/1 pins must be configured in the IOCON register block.
• Power: In the SYSAHBCLKCTRL register, set bit 7 and 8 in Table 24.
• The peripheral clock is determined by the system clock (see Table 23).
Remark: The register offsets and bit offsets for capture channel 1 are different on timers
CT16B0 and CT16B1. The affected registers are:
• Section 15.7.1 “Interrupt Register”
• Section 15.7.8 “Capture Control Register”
• Section 15.7.9 “Capture Registers”
• Section 15.7.11 “Count Control Register”
15.3 Features
• Two 16-bit counter/timers with a programmable 16-bit prescaler.
• Counter or timer operation
• Two 16-bit capture channels that can take a snapshot of the timer value when an input
signal transitions. A capture event may also optionally 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 16-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.
• Two 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.
• For each timer, up to four match registers can be configured as PWM allowing to use
up to two match outputs as single edge controlled PWM outputs.
UM10462
Chapter 15: LPC11U3x/2x/1x 16-bit counter/timers CT16B0/1
Rev. 5.5 — 21 December 2016 User manual
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