asks for the drivers, put the floppy disk sent with the USB245 into the computer’s floppy drive and

tell the setup routine which drive you placed it into (usually A:).

After it has completed setup, you can find the COM port the USB245 has been assigned, by

clicking on: Start

Settings Control Panel, then double click the System Icon

Device

Manager

Ports (COM &LPT). Here you should see: USB Serial Port (COMn), where n is the

COM port assigned.

Now that it has been found, unplug the USB cable from the PC. Never unplug the cable from

the USB245 end, while the other end is plugged into a PC or USB master..

Wire the 8 data lines and 4 status lines to your preprogrammed microcontroller. You can use

the 5V supply from pin 24, and the GND from pin 12 for you microcontroller. Do NOT tie another

5V source to the USB 5V source. RESET# is also available if needed.

Plug the USB cable back into the PC. The PC should now search for and find the proper driver

software. The PC may ‘freeze’ for about 25 seconds while the software is loaded. The chipset &

driver manufacturer explains that this is normal.

If the example program listed above was downloaded to your embedded processor, you should

be able to open a COM program like PCPlus, choose the correct COM Port, and start typing in

the data entry area and see you characters show up on the screen. If they show up twice, go to

half-duplex mode.

A very simple Basic program

USB

VAR

BYTE

REM A Place to store the character

REM I/O 0-7 used for DATA

LOW

8

REM I/O 8

used for WRITE SIGNAL, Start LOW

HIGH 9

REM I/O 9

used for READ SIGNAL, Start HIGH

REM I/O 10 used for RXF# input

REM TXE IS NOT CHECKED

10 IF IN10 = 0 THEN

REM IF RXF is LOW, there is a char available

LOW 9

REM make the READ line active LOW

USB=INL

REM read the character

HIGH 9

REM deactivate the

READ line

DIRL=%11111111

REM set PORT for OUTPUT

HIGH 8

REM strobe the WRITE line HIGH

OUTL=USB

REM output the character

LOW 8

REM bring the strobe back LOW LOW

DIRL=%00000000

REM set PORT for INPUT

END

GOTO 10