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MC68HC08JL8 Datasheet, PDF (121/212 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 9
Serial Communications Interface (SCI)
9.1 Introduction
This section describes the serial communications interface (SCI) module, which allows high-speed
asynchronous communications with peripheral devices and other MCUs.
9.2 Features
Features of the SCI module include the following:
⢠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
⢠Bus clock as baud rate clock source
9.3 Pin Name Conventions
The generic names of the SCI I/O pins are:
⢠RxD (receive data)
⢠TxD (transmit data)
The SCI I/O (input/output) lines are dedicated pins for the SCI module. Table 9-1 shows the full names
and the generic names of the SCI I/O pins.
MC68HC908JL8/JK8 ⢠MC68HC08JL8/JK8 ⢠MC68HC908KL8 Data Sheet, Rev. 3.1
Freescale Semiconductor
121
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