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参数资料
型号： ST72P63BE6M1
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封装： 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOP-24
文件页数： 107/145页
文件大小： 2984K
代理商： ST72P63BE6M1
ST7263BDx ST7263BHx ST7263BKx ST7263BE
64/145
12.3 Serial communications interface (SCI)
12.3.1 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.
12.3.2 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
■
Four error detection flags:
– Overrun error
– Noise error
– Frame error
– Parity error
■
Six interrupt sources with flags:
– Transmit data register empty
– Transmission complete
– Receive data register full
– Idle line received
– Overrun error detected
– Parity error
■
Parity control:
– Transmits parity bit
– Checks parity of received data byte
■
Reduced power consumption mode
12.3.3 General description
The interface is externally connected to another
device by two pins (see Figure 39):
– 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 interface uses two types of baud rate generator:
– A conventional type for commonly-used baud
rates.
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