|
MC908AP8CFBE Datasheet, PDF (155/324 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
|
◁ |
Chapter 11
Serial Communications Interface Module (SCI)
11.1 Introduction
The MC68HC908AP64 has two SCI modules:
⢠SCI1 is a standard SCI module, and
⢠SCI2 is an infrared SCI module.
This section describes SCI1, the serial communications interface (SCI) module, which allows high-speed
asynchronous communications with peripheral devices and other MCUs.
NOTE
When the SCI is enabled, the TxD pin is an open-drain output and requires
a pullup resistor to be connected for proper SCI operation.
11.2 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
⢠Configuration register bit, SCIBDSRC, to allow selection of baud rate clock source
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
155
|
▷ |