EM773 datasheet(12/51 Pages) PHILIPS

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EM773

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Product data sheet

Rev. 2 — 3 January 2012

12 of 51

NXP Semiconductors

EM773

Energy metering IC

7.8 UART

The EM773 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.

7.8.1 Features

• Maximum UART data bit rate of 3.125 MBit/s.

• 16 Byte 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.

• FIFO control mechanism that enables software flow control implementation.

• Support for RS-485/9-bit mode.

• Support for modem control.

7.9 SPI serial I/O controller

The SPI controller is capable of operation on a SSP, 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 SPI supports full

duplex transfers, with frames of 4 bits to 16 bits 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.

7.9.1 Features

• Maximum SPI speed of 25 Mbit/s (master) or 4.17 Mbit/s (slave) (in SSP mode)

• Compatible with Motorola SPI, 4-wire Texas Instruments SSI, and National

Semiconductor Microwire buses

• Synchronous serial communication

• Master or slave operation

• 8-frame FIFOs for both transmit and receive

• 4-bit to 16-bit frame

7.10 I2C-bus serial I/O controller

The EM773 contains one I2C-bus controller.

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

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