LPC2129 datasheet(16/44 Pages) NXP

16 / 44 page

LPC2109_2119_2129_6

Product data sheet

Rev. 06 — 10 December 2007

16 of 44

NXP Semiconductors

LPC2109/2119/2129

Single-chip 16/32-bit microcontrollers

• UART1 is equipped with standard modem interface signals. This module also

provides full support for hardware ﬂow control (auto-CTS/RTS).

6.10.2 UART features available in LPC2109/2119/2129/01 only

Compared to previous LPC2000 microcontrollers, UARTs in LPC2109/2119/2129/01

introduce a fractional baud rate generator for both UARTs, enabling these microcontrollers

to achieve standard baud rates such as 115200 Bd with any crystal frequency above

2 MHz. In addition, auto-CTS/RTS ﬂow-control functions are fully implemented in

hardware.

• Fractional baud rate generator enables standard baud rates such as 115200 Bd to be

achieved with any crystal frequency above 2 MHz.

• Auto-bauding.

• Auto-CTS/RTS ﬂow-control fully implemented in hardware.

6.11 I2C-bus serial I/O controller

The I2C-bus is a bidirectional bus 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 LPC2109/2119/2129 supports a bit rate up to 400 kbit/s (Fast

I2C-bus).

6.11.1 Features

• Standard I2C-bus compliant 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 may be used for test and diagnostic purposes.

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