Datasheet
LPC4350_30_20_10 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.2 — 18 August 2014 75 of 155
NXP Semiconductors
LPC4350/30/20/10
32-bit ARM Cortex-M4/M0 microcontroller
• DMA support.
7.18.2 USART0/2/3
The LPC4350/30/20/10 contain three USARTs. In addition to standard transmit and
receive data lines, the USARTs support a synchronous mode.
The USARTs include a fractional baud rate generator. Standard baud rates such as
115200 Bd can be achieved with any crystal frequency above 2 MHz.
7.18.2.1 Features
• Maximum UART data bit rate of 8 MBit/s.
• 16 B Receive and Transmit FIFOs.
• Register locations conform to 16C550 industry standard.
• Receiver FIFO trigger points at 1 B, 4 B, 8 B, and 14 B.
• Built-in fractional baud rate generator covering wide range of baud rates without a
need for external crystals of particular values.
• Auto baud capabilities and FIFO control mechanism that enables software flow
control implementation.
• Support for RS-485/9-bit/EIA-485 mode.
• USART3 includes an IrDA mode to support infrared communication.
• All USARTs have DMA support.
• Support for synchronous mode at a data bit rate of up to 8 Mbit/s.
• Smart card mode conforming to ISO7816 specification
7.18.3 SPI serial I/O controller
The LPC4350/30/20/10 contain one SPI controller. SPI is a full-duplex serial interface
designed to handle multiple masters and slaves connected to a given bus. Only a single
master and a single slave can communicate on the interface during a given data transfer.
During a data transfer the master always sends 8 bits to 16 bits of data to the slave, and
the slave always sends 8 bits to 16 bits of data to the master.
7.18.3.1 Features
• Maximum SPI data bit rate 25 Mbit/s.
• Compliant with SPI specification
• Synchronous, serial, full-duplex communication
• Combined SPI master and slave
• Maximum data bit rate of one eighth of the input clock rate
• 8 bits to 16 bits per transfer
7.18.4 SSP serial I/O controller
Remark: The LPC4350/30/20/10 contain two SSP controllers.
The SSP controller can operate on a SPI, 4-wire SSI, or Microwire bus. It can interact with
multiple masters and slaves on the bus. Only a single master and a single slave can
communicate on the bus during a given data transfer. The SSP supports full-duplex