LPC2158 datasheet(20/45 Pages) NXP

20 / 45 page

LPC2157_2158_2

Product data sheet

Rev. 02 — 9 February 2009

20 of 45

NXP Semiconductors

LPC2157/2158

Single-chip 16-bit/32-bit microcontrollers

6.12 I2C-bus serial I/O controller

The LPC2157/2158 each contain two I2C-bus controllers.

The I2C-bus is bidirectional, for inter-IC control using only two wires: a serial clock line

(SCL), and a serial data line (SDA). Each device is recognized by a unique address and

can operate as either a receiver-only device (e.g., an LCD driver or a transmitter with the

capability to both receive and send information (such as memory)). Transmitters and/or

receivers can operate in either master or slave mode, depending on whether the chip has

to initiate a data transfer or is only addressed. The I2C-bus is a multi-master bus, it can be

controlled by more than one bus master connected to it.

The I2C-bus implemented in LPC2157/2158 supports bit rates up to 400 kbit/s (Fast

I2C-bus).

6.12.1 Features

• Compliant with standard I2C-bus interface.

• Easy to conﬁgure as master, slave, or master/slave.

• Programmable clocks allow versatile rate control.

• Bidirectional data transfer between masters and slaves.

• Multi-master bus (no central master).

• Arbitration between simultaneously transmitting masters without corruption of serial

data on the bus.

• Serial clock synchronization allows devices with different bit rates to communicate via

one serial bus.

• Serial clock synchronization can be used as a handshake mechanism to suspend and

resume serial transfer.

• The I2C-bus can be used for test and diagnostic purposes.

6.13 SPI serial I/O controller

The LPC2157/2158 each contain one SPI controller. The 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 a byte of data to the slave, and

the slave always sends a byte of data to the master.

6.13.1 Features

• 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.

6.14 SSP serial I/O controller

The LPC2157/2158 each contain one Serial Synchronous Port controller (SSP). The SSP

controller is capable of operation on a SPI, 4-wire SSI, or Microwire bus. It can interact

with multiple masters and slaves on the bus. However, only a single master and a single

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