ST7263 datasheet(54/109 Pages) STMICROELECTRONICS

54 / 109 page

ST7263

54/109

5.5 SERIAL COMMUNICATIONS INTERFACE (SCI)

5.5.1 Introduction

The Serial Communications Interface (SCI) offers

a flexible means of full-duplex data exchange with

external equipment requiring an industry standard

NRZ asynchronous serial data format.

5.5.2 Main Features

Full duplex, asynchronous communications

NRZ standard format (Mark/Space)

Independently

programmable

transmit

and

receive baud rates up to 250K baud.

Programmable data word length (8 or 9 bits)

Receive buffer full, Transmit buffer empty and

End of Transmission flags

Two receiver wake-up modes:

– Address bit (MSB)

– Idle line

Muting function for multiprocessor configurations

Separate

enable

bits for Transmitter and

Receiver

Three error detection flags:

– Overrun error

– Noise error

– Frame error

Five interrupt sources with flags:

– Transmit data register empty

– Transmission complete

– Receive data register full

– Idle line received

– Overrun error detected

5.5.3 General Description

The interface is externally connected to another

device by two pins (see Figure 1):

– TDO: Transmit Data Output. When the transmit-

ter is disabled, the output pin returns to its I/O

port configuration. When the transmitter is ena-

bled and nothing is to be transmitted, the TDO

pin is at high level.

– RDI: Receive Data Input is the serial data input.

Oversampling techniques are used for data re-

covery by discriminating between valid incoming

data and noise.

Through this pins, serial data is transmitted and re-

ceived as frames comprising:

– An Idle Line prior to transmission or reception

– A start bit

– A data word (8 or 9 bits) least significant bit first

– A Stop bit indicating that the frame is complete.

ST7263 Scheda tecnica(PDF) 54 Page - STMicroelectronics

ST7263 Scheda tecnica(HTML) 54 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Scheda tecnica Scarica

Link URL