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EM773FHN33 Datasheet(PDF) 11 Page - NXP Semiconductors |
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EM773FHN33 Datasheet(HTML) 11 Page - NXP Semiconductors |
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11 / 45 page  EM773 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Objective data sheet Rev. 1 — 1 September 2010 11 of 45 NXP Semiconductors EM773 Energy metering IC 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 EM773 contains one SPI 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 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 is a multi-master bus and can be controlled by more than one bus master connected to it. |
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