MC68HC705C9ACB MOTOROLA [Motorola, Inc], MC68HC705C9ACB Datasheet - Page 88

• Manufacturer Part Number: MC68HC705C9ACB
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

Serial Communications Interface (SCI)
9.4 SCI Receiver Features
9.5 SCI Transmitter Features
9.6 Functional Description
Advance Information
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Features of the SCI receiver include:
Features of the SCI transmitter include:
A block diagram of the SCI is shown in
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
interrupts are enabled). The transfer of data to the transmit data shift
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Freescale Semiconductor, Inc.
For More Information On This Product,
Receiver wakeup function (idle line or address bit)
Idle line detection
Framing error detection
Noise detection
Overrun detection
Receiver data register full flag
Transmit data register empty flag
Transmit complete flag
Send break
Serial Communications Interface (SCI)
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Figure
MC68HC705C9A — Rev. 4.0
9-1. Option bits in serial
MOTOROLA