ST7232AK1B1 Datasheet

IC型号：
ST7232AK1B1
PDF描述：
8-BIT MCU WITH 8K FLASH/ROM, ADC, 4 TIMERS, SPI, SCI INTERFA...
文件大小：
1290.53KB
PDF页数：
154页
芯片厂家：
STMICROELECTRONICS

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ST7232A

10.5 SERIAL COMMUNICATIONS INTERFACE (SCI)

10.5.1 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. The SCI of-

fers a very wide range of baud rates using two

baud rate generator systems.

10.5.2 Main Features

鈻?/div>

Full duplex, asynchronous communications

鈻?/div>

NRZ standard format (Mark/Space)

鈻?/div>

Dual baud rate generator systems

鈻?/div>

Independently

programmable transmit and

receive baud rates up to 500K baud.

鈻?/div>

Programmable data word length (8 or 9 bits)

鈻?/div>

Receive buffer full, Transmit buffer empty and

End of Transmission flags

鈻?/div>

Two receiver wake-up modes:

鈥?Address bit (MSB)

鈥?Idle line

鈻?/div>

Muting function for multiprocessor configurations

鈻?/div>

Separate enable bits for Transmitter and

Receiver

鈻?/div>

Four error detection flags:

鈥?Overrun error

鈥?Noise error

鈥?Frame error

鈥?Parity error

鈻?/div>

Five interrupt sources with flags:

鈥?Transmit data register empty

鈥?Transmission complete

鈥?Receive data register full

鈥?Idle line received

鈥?Overrun error detected

鈻?/div>

Parity control:

鈥?Transmits parity bit

鈥?Checks parity of received data byte

鈻?/div>

Reduced power consumption mode

10.5.3 General Description

The interface is externally connected to another

device by two pins (see

Figure 51):

鈥?TDO: Transmit Data Output. When the transmit-

ter and the receiver are disabled, the output pin

returns to its I/O port configuration. When the

transmitter and/or the receiver are enabled and

nothing is to be transmitted, the TDO pin is at

high level.

鈥?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 these pins, serial data is transmitted and

received as frames comprising:

鈥?An Idle Line prior to transmission or reception

鈥?A start bit

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

鈥?A Stop bit indicating that the frame is complete.

This interface uses two types of baud rate generator:

鈥?A conventional type for commonly-used baud

rates,

鈥?An extended type with a prescaler offering a very

wide range of baud rates even with non-standard

oscillator frequencies.

85/154

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