MC68HC908LJ24 Datasheet, PDF (249/464 Pages) Motorola, Inc – Microcontrollers

Infrared Serial Communications Interface Module (IRSCI)
Pin Name Conventions
13.4 Pin Name Conventions
The generic names of the IRSCI I/O pins are:
• RxD (receive data)
• TxD (transmit data)
IRSCI I/O (input/output) lines are implemented by sharing parallel I/O
port pins. The full name of an IRSCI input or output reflects the name of
the shared port pin. Table 13-1 shows the full names and the generic
names of the IRSCI I/O pins.
The generic pin names appear in the text of this section.
Table 13-1. Pin Name Conventions
Generic Pin Names:
RxD
Full Pin Names:
PTB1/RxD
TxD
PTB0/TxD
13.5 IRSCI Module Overview
The IRSCI consists of a serial communications interface (SCI) and a
infrared interface sub-module as shown in Figure 13-2.
INTERNAL BUS
SCI_TxD
TxD
CGMXCLK
SERIAL
COMMUNICATIONS
INTERFACE MODULE
SCI_R32XCLK
SCI_R16XCLK
INFRARED
SUB-MODULE
BUS CLOCK
(SCI)
SCI_RxD
RxD
Figure 13-2. IRSCI Block Diagram
The SCI module provides serial data transmission and reception, with a
programmable baud rate clock based on the bus clock or the
CGMXCLK.
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor Infrared Serial Communications Interface Module (IRSCI)
Data Sheet
249