Serial Interface Programming - HP Compaq d330 DT Technical Reference Manual

5.4.2 SERIAL INTERFACE PROGRAMMING

Programming the serial interfaces consists of configuration, which occurs during POST, and
control, which occurs during runtime.
5.4.2.1 Serial Interface Configuration
The serial interface must be configured for a specific address range (COM1, COM2, etc.) and also
must be activated before it can be used. Address selection and activation of the serial interface are
affected through the PnP configuration registers of the LPC47B387 I/O controller.
The serial interface configuration registers are listed in the following table:
Table 5-11. Serial Interface Configuration Registers
Serial Interface Configuration Registers
Index
Address Function
30h Activate
60h Base Address MSB
61h Base Address LSB
70h Interrupt Select
F0h Mode Register
NOTE:
Refer to LPC47B387 data sheet for detailed register information.
Table 5-11.
hp compaq d330 and d530 Series of Personal Computers
Featuring the Intel Pentium 4 Processor
First Edition – June 2003
Technical Reference Guide
R/W
R/W
R/W
R/W
R/W
R/W
5-11