參數(shù)資料
型號： ST72F324B
廠商： 意法半導體
英文描述： 5V Range 8-Bit MCU With 8 TO 32K FLASH/ROM, 10-Bit ADC, 4 Timers, SPI, SCI Interface(具有ICP,IAP,Nested Interrupt,TLI,ROP的8位MCU)
中文描述： 5V范圍內(nèi)的8位8到32K閃存/ ROM，10位ADC，4個計時器，SPI和SCI接口（具有比較方案，國際檢察官聯(lián)合會，嵌套中斷，中華語文研習所，人事登記的8位微控制器）
文件頁數(shù)： 89/167頁
文件大?。?/td> 1641K
代理商： ST72F324B
ST72324B
89/167
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
■
Full duplex, asynchronous communications
■
NRZ standard format (Mark/Space)
■
Dual baud rate generator systems
■
Independently programmable transmit and
receive baud rates up to 500K 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
■
Four error detection flags:
– Overrun error
– Noise error
– Frame error
– Parity error
■
Five interrupt sources with flags:
– Transmit data register empty
– Transmission complete
– Receive data register full
– Idle line received
– Overrun error detected
■
Parity control:
– Transmits parity bit
– Checks parity of received data byte
■
Reduced power consumption mode
10.5.3 General Description
The interface is externally connected to another
device by two pins (see Figure 2.):
– 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.
– 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:
– 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.
This nterface uses two types of baud rate generator:
– A conventional type for commonly-used baud
rates,
– An extended type with a prescaler offering a very
wide range of baud rates even with non-standard
oscillator frequencies.
1
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