Intel 2804040 user manual Appendix D Programming GPIO’s

2804040 User’s Manual Hardware Test

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.

Programming GPIO’s 59