COMMELL MS-C71 - Manual (Page 46)

MS-C71 User’s Manual
- 44 -
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 2 E 87 ;enter configuration
-o 2E 87
-o 2E 07
-o 2F 09 ; enable 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 values
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.