COMMELL LS-571 - Manual (Page 55)

LS-571 User’s Manual
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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
-o 2E 87 ;Enter configuration
-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’s 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 W83627DHG datasheet.