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P4LA User’s Manual Hardware Test

Programming GPIO’s 61

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 2E 87 ;enter configuration

-o 2E 87

-o 2E 29

-o 2E 40 ;enale GPIO function

-o 2E 07

-o 2E 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

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 W83627THF datasheet.

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Commell P4LA Manual do Utilizador Página 61