TMPR3916 datasheet(176/225 Pages) TOSHIBA

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Chapter 10 Asynchronous Serial Interface (UART)

Preliminary

10-1

10. Asynchronous Serial Interface (UART)

The Asynchronous Serial Interface (UART) has the following features:

•

Four channels

•

Full-duplex transfer

•

Baud rate generator

•

Modem flow control (RTS/CTS), available on channels 1 and 2 only

•

Transmit and receive FIFO, each of size 2 entries

•

Multi controller system support (master/slave

* operation capable)

10.1 Operations on Serial Interface

10.1.1

Outline

The UART is used to convert parallel data, retrieved from memory, to a serial stream with control and

error detection bits. The same applies for data receive: only that a serial stream of data is converted to

parallel by means of a shift register and then put into a FIFO. To retrieve data from memory or store

data into memory one of the following policies is available:

•

polling the Interrupt Status Register

•

by serving an interrupt

•

by DMA transfer.

The rate at which data is transferred (Baud Rate) can be programmed in the Baud Rate Control

Care has to be taken in the configuration of the TMPR3916 to enable the I/Os of the UART.

* Please read carefully the documentation if the device has to be used for slave operation, since the TMPR3916 does not

have open drain output pins.

TMPR3916 Datasheet(PDF) 176 Page - Toshiba Semiconductor