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IQ31244 Customer Reference Board
User’s Manual 27
6.3 Console 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.
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).
6.4 Rotary Switch
Table 19 describes the four-bit binary value generated by the rotary switch (S1).
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
Table 19. Read-Only Rotary Switch
Bit Signal
0A
1B
2C
3D