I am starting to write a assembly program for a mc68hc12. I will be reading a 8 bit signed number into PortA and outputting the results to 7 segment LED's, common anode. I will be using Port P to ouput the segments and PortCan to control the LED's displayed. I assume I need 4 LED's, 1 for the sign and 3 LEDs for the max number of 128. If I hard wired the data in I get something like below. How would I go about pulling the data in from a port and then displaying the number on a set of LED's?
org $1000 ldaa #$ff staa DDRP ldaa #$7c staa DDRCAN forever ldy #display next ldaa 0,y staa PORTP ldaa PROTCAN anda #$83 staa PROTCAN ldaa 1,y oraa PORTCAN staa PORTCAN ;a delay subroutine here to would cycle back to forever display fcc $30,$40 fcc $6d,$20 fcc $79,$10 fcc $33,$08 fcc $5b,$04