COMMELL LV-669 - Manual (Page 55)

LV-669 User’s Manual Programming GPIO’s
Programming GPIO’s 55
Appendix D
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 2A
-o 2F FD ;enable GPIO function
-o 2E 07
-o 2F 07 ;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 value 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 W83697UG datasheet.