Global American 2807770, User Manual

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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 4E 87 ;enter configuration
-o 4E 87
-o 4E 07
-o 4F 09 ;enale GPIO function
-o 4E 30
-o 4F 02 ;enable GPIO configuration
-o 4E F0
-o 4F xx ;set GPIO as input/output; set ‘1’ for input,’0’for
output
-o 4E F1
-o 4F xx ;if set GPIO’s as output,in this register its value can
be set
Optional :
-o 4E F2
-o 4F xx ; Data inversion register ; ‘1’ inverts the current valus
of the bits ,’0’ leaves them as they are
-o 4E 30
-o 4F 01 ; active GPIO’s
For further information, please refer to Winbond W83627DHG datasheet.