Intel IQ31244 user manual 6.3Console Serial Port, 6.4Rotary Switch, Console Serial Port Connector

Intel® IQ31244 Customer Reference Board

6.3Console Serial Port

A single console serial port with a DB-9 line interface is included on the IQ31244. This port can be connected to a host system through the DB-9 connector from the rear I/O.

Table 18. Console Serial Port Connector

Pin	Signal	Description
1	N/C	Not used
2	RXD	Receive data
3	TXD	Transmit data
4	N/C	Not used
5	GND	Signal ground
6	N/C	Not used
7	RTS	Request to send
8	CTS	Clear to send
9	N/C	Not used

The serial port is based on a Texas Instruments* TL16C550 UART clocked at 1.843 Mhz. The device can be programmed to use this clock with the internal baud rate counters. The serial port can operate at speeds from 300 to 115,200 bps and can be operated in interrupt-driven or polled mode. For a detailed description of the registers and device operation, refer to the TL16C550 documentation (see Table 5, “Documents and Manufacturers” on page 13).

6.4Rotary Switch

Table 19 describes the four-bit binary value generated by the rotary switch (S1).

Table 19. Read-Only Rotary Switch

Bit	Signal
0	A
1	B
2	C
3	D

User’s Manual 27