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ME-C79 User’s Manual

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Appendix C <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. The DC character please refer to GPIO paragraph(Page25).

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.

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