MC68HC908AP16CFB datasheet(233/440 Pages) MOTOROLA

233 / 440 page

Serial Communications Interface Module (SCI)

I/O Registers

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

233

LOOPS — Loop Mode Select Bit

This read/write bit enables loop mode operation. In loop mode the

RxD pin is disconnected from the SCI, and the transmitter output goes

into the receiver input. Both the transmitter and the receiver must be

enabled to use loop mode. Reset clears the LOOPS bit.

1 = Loop mode enabled

0 = Normal operation enabled

ENSCI — Enable SCI Bit

This read/write bit enables the SCI and the SCI baud rate generator.

Clearing ENSCI sets the SCTE and TC bits in SCI status register 1

and disables transmitter interrupts. Reset clears the ENSCI bit.

1 = SCI enabled

0 = SCI disabled

TXINV — Transmit Inversion Bit

This read/write bit reverses the polarity of transmitted data. Reset

clears the TXINV bit.

1 = Transmitter output inverted

0 = Transmitter output not inverted

NOTE:

Setting the TXINV bit inverts all transmitted values, including idle, break,

start, and stop bits.

Address:

$0013

Bit 7

654321

Bit 0

Read:

LOOPS

ENSCI

TXINV

WAKE

ILTY

PEN

PTY

Write:

Reset:

00000000

Figure 13-9. SCI Control Register 1 (SCC1)

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 233 Page - Motorola, Inc

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