Datasheet

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

Frees

cale Semiconductor,

Freescale Semiconductor, Inc.

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