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TS-2200 User's Manual
In the default configuration, P1.5, P1.0 and P3.6 are all initialized as inputs, while P3.0, P3.1, and
P3.3 are initialized as "peripherals" (IRQ4, IRQ3, and IRQ5)
Warning: When changing these registers, always use read/modify/write procedures so that
other port pins (used by on-board peripherals) are not affected.
For example, let's say you want to use 386EX Port 3.1 (DIO1 pin 11) as an output rather than IRQ3
(the default configuration).
1. Read P3CFG (I/O F824h), AND it with 0FDh, write it back to F824h. (changes from peripheral
to I/O pin)
2. Read P3DIR (I/O F874h), AND it with 0FDh, write it back to F874h. (this made it a
complementary output)
3. To set this pin to a "1", Read P3LTC (I/O F872h), OR it with 02h, write it back.
Note: Because the serial ports are internal to the 386EX, COM1 and COM2 can still use IRQ4 and
IRQ3 even when the associated pins P3.1 and P3.0 are configured as DIO pins DIO1.11 and DIO1.12
– the interrupts are simply no longer available on the PC/104 bus.
Appendix H - Further References
Technologic Systems Web Site
http://www.embeddedx86.com/
Crystal CS8900A Ethernet Controller Overview
http://www.cirrus.com/products/overviews/cs8900a.html
Dallas Semiconductor DS12887 Data Sheet
Intel 386EX User's Guide
http://developer.intel.com/design/intarch/manuals/272485.htm
Maxim Integrated Products
http://www.maxim-ic.com/
National Semiconductor NS16C450 Data Sheet
Omen Technologies
http://www.omen.com/
PC/104 Consortium Web Site
http://www.pc104.org/
Waterloo TCP/IP Software (WATTCP)
http://www.wattcp.com/
Appendix I - Manual Revisions
•
11/06/00
updated URL to Waterloo TCP/IP homepage
•
11/02/00
updated URL to Intel 386EX User's Guide
•
updated System I/O map
•
07/22/99
Added info on the integrated BIOS Debugger
•
Describe ethernet LEDs
•
Changed Appendix E to mention 2048 KB Flash
•
07/21/99
Rewrote Appendix G
•
Corrected minor errors
•
07/20/99
New Manual
21
Technologic Systems
11/06/2000
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