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MC68HC908AZ60A_13 Datasheet, PDF (177/414 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 18
Serial Communications Interface (SCI)
18.1 Introduction
The SCI allows asynchronous communications with peripheral devices and other MCUs.
18.2 Features
The SCI moduleâs features 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
18.3 Pin Name Conventions
The generic names of the SCI input/output (I/O) pins are:
⢠RxD (receive data)
⢠TxD (transmit data)
SCI I/O lines are implemented by sharing parallel I/O port pins. The full name of an SCI input or output
reflects the name of the shared port pin. Table 18-1 shows the full names and the generic names of the
SCI I/O pins.The generic pin names appear in the text of this subsection.
MC68HC908AZ60A ⢠MC68HC908AS60A ⢠MC68HC908AS60E Data Sheet, Rev. 6
Freescale Semiconductor
177
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