MC908AP16CFAE Datasheet, PDF (181/324 Pages) Freescale Semiconductor, Inc – Table of Contents

Chapter 12
Infrared Serial Communications Interface Module (IRSCI)
12.1 Introduction
The MC68HC908AP64 has two SCI modules:
• SCI1 is a standard SCI module, and
• SCI2 is an infrared SCI module.
This section describes SCI2, the infrared serial communications interface (IRSCI) module which allows
high-speed asynchronous communications with peripheral devices and other MCUs. This IRSCI consists
of an SCI module for conventional SCI functions and a software programmable infrared encoder/decoder
sub-module for encoding/decoding the serial data for connection to infrared LEDs in remote control
applications.
NOTE
When the IRSCI is enabled, the SCTxD pin is an open-drain output and
requires a pullup resistor to be connected for proper SCI operation.
Features of the SCI module include the following:
• Full duplex operation
• Standard mark/space non-return-to-zero (NRZ) format
• Programmable 8-bit or 9-bit character length
• Separately enabled transmitter and receiver
• Separate receiver and transmitter CPU interrupt requests
• Two receiver wakeup methods:
– Idle line wakeup
– Address mark wakeup
• Interrupt-driven operation with eight interrupt flags:
– Transmitter empty
– Transmission complete
– Receiver full
– Idle receiver input
– Receiver overrun
– Noise error
– Framing error
– Parity error
• Receiver framing error detection
• Hardware parity checking
• 1/16 bit-time noise detection
Features of the infrared (IR) sub-module include the following:
• IR sub-module enable/disable for infrared SCI or conventional SCI on SCTxD and SCRxD pins
• Software selectable infrared modulation/demodulation
(3/16, 1/16 or 1/32 width pulses)
MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor
181