Commell ME-C79, User Manual, Page: 45 / 47

ME-C79
User’s Manual
-39-
Appendix C <Programming GPIO
’s>
The GPIO‟can be programmed with the MSDOS debug program using
simple IN/OUT commands.The following lines show an example how to
do this.
GPIO0…..GPIO7 bit0……bit7
-o 2 E 87 ;enter configuration
-o 2E 87
-o 2E 07
-o 2F 09 ;enale GPIO function
-o 2E 30
-o 2F 02 ;enable GPIO configuration
-o 2E F0
-o 2
F xx ;set GPIO as input/output; set „1‟ for input,‟0‟for
output
-o 2E F1
-o 2
F xx ;if set GPIO‟s as output,in this register its value can
be set
Optional :
-o 2E F2
-o 2
F xx ; Data inversion register ; „1‟ inverts the current valus
of the bits ,‟0‟ leaves them as they are
-o 2E 30
-o 2F 01
; active GPIO‟s
For further information, please refer to Winbond W83627DHG datasheet.