MC908AP32CFBE Datasheet, PDF (181/324 Pages) Freescale Semiconductor, Inc – The following revision history table summarizes changes contained in this document. For your convenience, the page number designators have been linked to the appropriate location.

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