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SY87729/39L
Micrel, Inc.
Figure 3. Filling in the I/O Ports Tab
You then click the “ Add ” button. This selects the range of
I/O addresses specified, and places it into the “ Active Ports ”
Window, as shown in Figure 4.
Figure 4. After pressing the “Add” Button
To continue with this example, the SY87729/39L
evaluation board application also needs access to I/O
addresses 0x778 through 0x77A. Thus, type “ 778 ” in the
“ Begin ” edit box, and type “ 77A ” in the “ End ” edit box. Then
click the “ Add ” button. The “ Direct-IO ” control panel should
look like Figure 5.
Evaluation Board
Figure 6. Correct I/O Addresses for LPT2 Access
Finally, to access both LPT1 and LPT2, the “ Direct-IO ”
control panel should look like Figure 7.
Figure 7. Correct I/O Addresses for both LPT1
and LPT2 Access
After entering the I/O addresses to allow access to, you
must specify the program or programs allowed to access
these I/O locations. Click the “ Security ” tab. Click the
“ Browse... ” button. Select the directory into which you placed
the SY87729/39L evaluation board application programs,
and select the application, “ 739ev. ” The path and application
will appear in the “ Allowed Processes: ” edit box. Click the
“ Add ” button to include “ 739ev ” in the list of allowed
programs. The “ Direct-IO ” control panel should look like
Figure 8, except that the path will be whatever you chose.
Figure 5. Correct I/O Addresses for LPT1 Access
Consulting Table 1, If you are accessing only LPT2, the
“ Direct-IO ” control panel should look like Figure 6.
Figure 8. Including “739ev” in the List of Allowed
Processes
M9999-071906
hbwhelp@micrel.com or (408) 955-1690
4
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