M68ICS08GR datasheet(252/408 Pages) FREESCALE

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Serial Communications Interface (SCI)

Technical Data

MC68HC908GR8 — Rev 4.0

252

Serial Communications Interface (SCI)

MOTOROLA

18.8.2 PE1/RxD (Receive Data)

The PE1/RxD pin is the serial data input to the SCI receiver. The SCI

shares the PE1/RxD pin with port E. When the SCI is enabled, the

PE1/RxD pin is an input regardless of the state of the DDRE1 bit in data

direction register E (DDRE).

18.9 I/O Registers

These I/O registers control and monitor SCI operation:

•

SCI control register 1 (SCC1)

•

SCI control register 2 (SCC2)

•

SCI control register 3 (SCC3)

•

SCI status register 1 (SCS1)

•

SCI status register 2 (SCS2)

•

SCI data register (SCDR)

•

SCI baud rate register (SCBR)

18.9.1 SCI Control Register 1

SCI control register 1:

•

Enables loop mode operation

•

Enables the SCI

•

Controls output polarity

•

Controls character length

•

Controls SCI wakeup method

•

Controls idle character detection

•

Enables parity function

•

Controls parity type

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