ST72E632K2B0 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST72E632K2B0

LOW SPEED USB 8-BIT MCU FAMILY with up to 16K MEMORY, up to 512 BYTES RAM, 8-BIT ADC, WDG, TIMER, SCI & I2C

STMicroelectronics 

ST7263

5.5 SERIAL COMMUNICATIONS INTERFACE (SCI)

5.5.1 Introduction

5.5.3 General Description

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

s Full duplex, asynchronous communications

s NRZ standard format (Mark/Space)

s Independently programmable transmit and

receive baud rates up to 250K baud.

s Programmable data word length (8 or 9 bits)

s Receive buffer full, Transmit buffer empty and

End of Transmission flags

s Two receiver wake-up modes:

– Address bit (MSB)

– Idle line

s Muting function for multiprocessor configurations

s Separate enable bits for Transmitter and

Receiver

s Three error detection flags:

– Overrun error

– Noise error

– Frame error

s Five interrupt sources with flags:

– Transmit data register empty

– Transmission complete

– Receive data register full

– Idle line received

– Overrun error detected

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.

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