M68ICS08GR datasheet(253/408 Pages) FREESCALE

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Serial Communications Interface (SCI)

I/O Registers

MC68HC908GR8 — Rev 4.0

Technical Data

MOTOROLA

Serial Communications Interface (SCI)

253

LOOPS — Loop Mode Select Bit

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

PE1/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.

M — Mode (Character Length) Bit

This read/write bit determines whether SCI characters are eight or

nine bits long. See Table 18-5. The ninth bit can serve as an extra

stop bit, as a receiver wakeup signal, or as a parity bit. Reset clears

the M bit.

Address:

$0013

Bit 7

654321

Bit 0

Read:

LOOPS

ENSCI

TXINV

WAKE

ILTY

PEN

PTY

Write:

Reset:

00000000

Figure 18-9. SCI Control Register 1 (SCC1)

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

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