MC68HC711D3CFNE2 Datasheet, PDF(73/124 Page) Freescale Semiconductor, Inc

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MC68HC711D3CFNE2 Datasheet, PDF (73/124 Pages) Freescale Semiconductor, Inc – Power Saving STOP and WAIT Modes

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Freescale Semiconductor, Inc.

SBK â Send Break

At least one character time of break is queued and sent each time SBK is written to

one. More than one break may be sent if the transmitter is idle at the time the SBK bit

is toggled on and off, as the baud rate clock edge could occur between writing the one

and writing the zero to SBK.

0 = Break generator off

1 = Break codes generated as long as SBK = 1

7.6.4 Serial Communication Status Register (SCSR)

The SCSR provides inputs to the interrupt logic circuits for generation of the SCI sys-

tem interrupt.

SCSR â SCI Status Register

$002E

Bit 7

Bit 0

TDRE

RDRF

IDLE

RESET:

TDRE â Transmit Data Register Empty Flag

This flag is set when SCDR is empty. Clear the TDRE flag by reading SCSR with

TDRE set and then writing to SCDR.

0 = SCDR busy

1 = SCDR empty

TC â Transmit Complete Flag

This flag is set when the transmitter is idle (no data, preamble, or break transmission

in progress). Clear the TC flag by reading SCSR with TC set and then writing to SCDR.

0 = Transmitter busy

1 = Transmitter idle

RDRF â Receive Data Register Full Flag

This flag is set if a received character is ready to be read from SCDR. Clear the RDRF

flag by reading SCSR with RDRF set and then reading SCDR.

0 = SCDR empty

1 = SCDR full

IDLE â Idle Line Detected Flag

This flag is set if the RxD line is idle. Once cleared, IDLE is not set again until the RxD

line has been active and becomes idle again. The IDLE flag is inhibited when RWU =

1. Clear IDLE by reading SCSR with IDLE set and then reading SCDR.

0 = RxD line is active

1 = RxD line is idle

OR â Overrun Error Flag

OR is set if a new character is received before a previously received character is read

from SCDR. Clear the OR flag by reading SCSR with OR set and then reading SCDR.

0 = No overrun

1 = Overrun detected

SERIAL COMMUNICATIONS INTERFACE

TECHNICAL DATA

7-7

For More Information On This Product,

Go to: www.freescale.com

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