COMMELL P4ELA - Manual (Page 56)

P4ELA User’s Manual
56
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 2E 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 2F xx ;set GPIO as input/output; set ‘1’ for input,’0’for output
-o 2E F1
-o 2F xx ;if set GPIO’s as output,in this register its value can be set
Optional :
-o 2E F2
-o 2F 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.