參數(shù)資料
型號: MC68HSC05C9A
廠商: Motorola, Inc.
元件分類: 8位微控制器
英文描述: 8-Bit Microcontroller(8位微控制器)
中文描述: 8位微控制器(8位微控制器)
文件頁數(shù): 72/160頁
文件大?。?/td> 783K
代理商: MC68HSC05C9A
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Serial Communications Interface (SCI)
General Release Specification
MC68HC05C9A
Rev. 4.0
72
Serial Communications Interface (SCI)
MOTOROLA
9.4 SCI Receiver Features
Features of the SCI receiver include:
Receiver Wakeup Function (Idle Line or Address Bit)
Idle Line Detection
Framing Error Detection
Noise Detection
Overrun Detection
Receiver Data Register Full Flag
9.5 SCI Transmitter Features
Features of the SCI transmitter include:
Transmit Data Register Empty Flag
Transmit Complete Flag
Send Break
9.6 Functional Description
A block diagram of the SCI is shown in
Figure 9-1
. Option bits in serial
control register1 (SCCR1) select the wakeup method (WAKE bit) and
data word length (M bit) of the SCI. SCCR2 provides control bits that
individually enable the transmitter and receiver, enable system
interrupts, and provide the wakeup enable bit (RWU) and the send break
code bit (SBK). Control bits in the baud rate register (BAUD) allow the
user to select one of 32 different baud rates for the transmitter and
receiver.
Data transmission is initiated by writing to the serial communications
data register (SCDR). Provided the transmitter is enabled, data stored in
the SCDR is transferred to the transmit data shift register. This transfer
of data sets the transmit data register empty flag (TDRE) in the SCI
status register (SCSR) and generates an interrupt (if transmitter
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