MC68HC705C9ACFN datasheet(82/157 Pages) FREESCALE

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General Release Speciﬁcation

SCI Receiver Features

MC68HC705C9A — Rev. 2.0

Serial Communications Interface (SCI)

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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