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MC68HC908GR8A Datasheet, PDF (129/252 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 13
Serial Communications Interface (SCI) Module
13.1 Introduction
This section describes the serial communications interface (SCI) module, which allows high-speed
asynchronous communications with peripheral devices and other MCUs.
13.2 Features
Features of the SCI module include:
⢠Full-duplex operation
⢠Standard mark/space non-return-to-zero (NRZ) format
⢠32 programmable baud rates
⢠Programmable 8-bit or 9-bit character length
⢠Separately enabled transmitter and receiver
⢠Separate receiver and transmitter CPU interrupt requests
⢠Programmable transmitter output polarity
⢠Two receiver wakeup methods:
â Idle line wakeup
â Address mark wakeup
⢠Interrupt-driven operation with eight interrupt flags:
â Transmitter empty
â Transmission complete
â Receiver full
â Idle receiver input
â Receiver overrun
â Noise error
â Framing error
â Parity error
⢠Receiver framing error detection
⢠Hardware parity checking
⢠1/16 bit-time noise detection
⢠Mask option register bit, SCIBDSRC, to allow selection of baud rate clock source
MC68HC908GR8A ⢠MC68HC908GR4A Data Sheet, Rev. 2
Freescale Semiconductor
129
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