Datasheet

Product data sheet Rev. 4 — 19 August 2014 77 of 158

NXP Semiconductors

LPC435x/3x/2x/1x

32-bit ARM Cortex-M4/M0 microcontroller

7.19.2.1 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

7.19.3 SPI serial I/O controller

Remark: The LPC435x/3x/2x/1x 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.

7.19.3.1 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

7.19.4 SSP serial I/O controller

Remark: The LPC435x/3x/2x/1x 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

transfers, with frames of 4 bit to 16 bit of data flowing from the master to the slave and

from the slave to the master. In practice, often only one of these data flows carries

meaningful data.

7.19.4.1 Features

• Maximum SSP speed in full-duplex mode of 25 Mbit/s; for transmit only 50 Mbit/s

(master) and 15 Mbit/s (slave)