LPC1313 datasheet(18/53 Pages) NXP

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LPC1311_13_42_43_1

Product data sheet

Rev. 01 — 11 December 2009

18 of 53

NXP Semiconductors

LPC1311/13/42/43

32-bit ARM Cortex-M3 microcontroller

7.9 USB interface (LPC1342/43 only)

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. All transactions are initiated by the

host controller.

The LPC1342/43 USB interface is a device controller with on-chip PHY for device

functions.

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. An interrupt is also generated if enabled.

7.9.1.1

Features

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

• Supports 10 physical (5 logical) endpoints with up to 64 bytes buffer RAM per

endpoint (see Table 5).

• Supports Control, Bulk, Isochronous, and Interrupt endpoints.

• Supports SoftConnect feature.

• Double buffer implementation for Bulk and Isochronous endpoints.

7.10 UART

The LPC1311/13/42/43 contains one UART.

Support for RS-485/9-bit mode allows both software address detection and automatic

address detection using 9-bit mode.

The UART includes a fractional baud rate generator. Standard baud rates such as

115200 Bd can be achieved with any crystal frequency above 2 MHz.

Table 5.

USB device endpoint conﬁguration

Logical

endpoint

Physical

endpoint

Endpoint type

Direction

Packet size

(byte)

Double buffer

Control

out

Control

Interrupt/Bulk

out

Interrupt/Bulk

out

Interrupt/Bulk

out

yes

Interrupt/Bulk

yes

Isochronous

out

512

yes

Isochronous

512

yes

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