Appendix D <Programming Gpio's - AMD Geode LX800 User Manual

LE-366 User's Manual
Appendix D <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 4E 87
-o 4E 87
-o 4E 2A
-o 4F FD
-o 4E 07
-o 4F 07
-o 4E F0
-o 4F xx
-o 4E F1
-o 4F xx
Optional :
-o 4E F2
-o 4F xx
-o 4E 30
-o 4F 01
For further information, please refer to Winbond W83627HG datasheet.
;enter configuration
;enable GPIO function
;enable GPIO configuration
;set GPIO as input/output; set '1' for input,'0'for output
;if set GPIO's as output, in this register its value can be set
; Data inversion register ; '1' inverts the current value of the
bits ,'0' leaves them as they are
; active GPIO's
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