MC68HC908LJ12 Datasheet, PDF (249/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Infrared Serial Communications
Table 13-5 shows a summary of I/O pin functions when the SCI is
enabled.
Table 13-5. SCI Pin Functions (Standard and Infrared)
SCC1 SCIRCR SCC2
[ENSCI] [IREN]
[TE]
SCC2
[RE]
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
0
X
X
X
Notes:
1. After completion of transmission in progress.
TxD Pin
RxD Pin
Hi-Z⁽¹⁾
Input ignored (terminate externally)
Hi-Z⁽¹⁾
Input sampled, pin should idle high
Output SCI (idle high)
Input ignored (terminate externally)
Output SCI (idle high)
Input sampled, pin should idle high
Hi-Z⁽¹⁾
Input ignored (terminate externally)
Hi-Z⁽¹⁾
Input sampled, pin should idle high
Output IR SCI (idle high) Input ignored (terminate externally)
Output IR SCI (idle high) Input sampled, pin should idle high
Pins under port control (standard I/O port)
13.11 I/O Registers
The following I/O registers control and monitor SCI operation:
• SCI control register 1 (SCC1)
• SCI control register 2 (SCC2)
• SCI control register 3 (SCC3)
• SCI status register 1 (SCS1)
• SCI status register 2 (SCS2)
• SCI data register (SCDR)
• SCI baud rate register (SCBR)
• SCI infrared control register (SCIRCR)
Technical Data
250
MC68HC908LJ12 — Rev. 2.1
Infrared Serial Communications Interface Module (IRSCI) Freescale Semiconductor