COMMELL LS-373 - Manual (Page 47)

LS-373 User’s Manual
- 47 -
Appendix D <Programming GPIO’s>
The GPIO’s 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 ;Enable GPIO’s function
-o 2E 30
-o 2F 02 ;Enable GPIO’s 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.