Datasheet

Product data sheet Rev. 2.2 — 11 March 2014 20 of 77

NXP Semiconductors

LPC11U3x

32-bit ARM Cortex-M0 microcontroller

7.8.1 Features

• GPIO pins can be configured as input or output by software.

• All GPIO pins default to inputs with interrupt disabled at reset.

• Pin registers allow pins to be sensed and set individually.

• Up to eight GPIO pins can be selected from all GPIO pins to create an edge- or

level-sensitive GPIO interrupt request.

• Any pin or pins in each port can trigger a port interrupt.

7.9 USB interface

The Universal Serial Bus (USB) is a 4-wire bus that supports communication between a

host and one or more (up to 127) peripherals. The host controller allocates the USB

bandwidth to attached devices through a token-based protocol. The bus supports

hot-plugging and dynamic configuration of the devices. The host controller initiates all

transactions.

The LPC11U3x USB interface consists of a full-speed device controller with on-chip PHY

(PHYsical layer) for device functions.

Remark: Configure the LPC11U3x in default power mode with the power profiles before

using the USB (see Section 7.18.5.1

). Do not use the USB with the part in performance,

efficiency, or low-power mode.

7.9.1 Full-speed USB device controller

The device controller enables 12 Mbit/s data exchange with a USB Host controller. It

consists of a register interface, serial interface engine, and endpoint buffer memory. The

serial interface engine decodes the USB data stream and writes data to the appropriate

endpoint buffer. The status of a completed USB transfer or error condition is indicated via

status registers. If enabled, an interrupt is generated.

7.9.1.1 Features

• Dedicated USB PLL available.

• Fully compliant with USB 2.0 specification (full speed).

• Supports 10 physical (5 logical) endpoints including one control endpoint.

• Single and double buffering supported.

• Each non-control endpoint supports bulk, interrupt, or isochronous endpoint types.

• Supports wake-up from Deep-sleep mode and Power-down mode on USB activity

and remote wake-up.

• Supports SoftConnect.

7.10 I/O Handler (LPC11U37HFBD64/401 only)

The I/O Handler is a software library-supported hardware engine for emulating serial

interfaces and off-loading the CPU for processing-intensive functions. The I/O Handler

can emulate, among others, DMA and serial interfaces such as UART, I

C, or I

S with no

or very low additional CPU load. The software libraries are available with supporting