MC68HC908AP16CFB datasheet(259/440 Pages) MOTOROLA

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Infrared Serial Communications Interface Module (IRSCI)

SCI Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

259

14.6.2.3 Break Characters

Writing a logic 1 to the send break bit, SBK, in IRSCC2 loads the transmit

shift register with a break character. A break character contains all logic

0s and has no start, stop, or parity bit. Break character length depends

on the M bit in IRSCC1. As long as SBK is at logic 1, transmitter logic

continuously loads break characters into the transmit shift register. After

software clears the SBK bit, the shift register finishes transmitting the

last break character and then transmits at least one logic 1. The

automatic logic 1 at the end of a break character guarantees the

recognition of the start bit of the next character.

The SCI recognizes a break character when a start bit is followed by

eight or nine logic 0 data bits and a logic 0 where the stop bit should be.

Receiving a break character has the following effects on SCI registers:

•

Sets the framing error bit (FE) in IRSCS1

•

Sets the SCI receiver full bit (SCRF) in IRSCS1

•

Clears the SCI data register (IRSCDR)

•

Clears the R8 bit in IRSCC3

•

Sets the break flag bit (BKF) in IRSCS2

•

May set the overrun (OR), noise flag (NF), parity error (PE), or

reception in progress flag (RPF) bits

14.6.2.4 Idle Characters

An idle character contains all logic 1s and has no start, stop, or parity bit.

Idle character length depends on the M bit in IRSCC1. The preamble is

a synchronizing idle character that begins every transmission.

If the TE bit is cleared during a transmission, the TxD pin becomes idle

after completion of the transmission in progress. Clearing and then

setting the TE bit during a transmission queues an idle character to be

sent after the character currently being transmitted.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 259 Page - Motorola, Inc

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