Keyscanning Routine Problem with Freescale Motorola HCS08. - Electronic Circuits Projects Diagrams Free

GraveYard_Killer · 30th March 2005, 02:41 PM

i have problem with keyscanning routine with this evaluation board. http://www.freescale.com/files/abstr....htm?tid=tmhfp

i created my own keyscanning routine with the PORTA 0-5 as inputs and output on PORTC 0-3 thus creating a 6X4 keypad. i enabled the pull ups of part A in the software and turned off the watchdog timer, but it seems that when i dont press a key yet, it seems that Row 1 and Column 1 (PA.0 and PC.0 ) are pressed (i used the 4 leds supplied in the demo kit to know if im doing right.). anyboady experienced the same problem?

btw, it is a very good MCU. maybe it will take time for me to tame this beast.

ops:

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30th March 2005, 02:41 PM	#1
GraveYard_Killer	Keyscanning Routine Problem with Freescale Motorola HCS08. i have problem with keyscanning routine with this evaluation board. http://www.freescale.com/files/abstr....htm?tid=tmhfp i created my own keyscanning routine with the PORTA 0-5 as inputs and output on PORTC 0-3 thus creating a 6X4 keypad. i enabled the pull ups of part A in the software and turned off the watchdog timer, but it seems that when i dont press a key yet, it seems that Row 1 and Column 1 (PA.0 and PC.0 ) are pressed (i used the 4 leds supplied in the demo kit to know if im doing right.). anyboady experienced the same problem? btw, it is a very good MCU. maybe it will take time for me to tame this beast. ops: __________________ Learning is a life-long process...