laguna92651

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 …

I am trying to count the number of 1's in a sixteen bit word for MC68HC12. The only way I can think of is to use 16 BITA instructions, one for each bit location, then increment a counter. I suspect there is a more elegant way to do this. Could …

I am trying to understand how assembly is translated into machine language. I understand how to get the machine coding formats but I'm not sure how to calculate 'rr' in all cases. For the example example bra is 20 rr or 20 03, I know that the relative offset is …

I am learning assembly on a MC68HC12. Can someone explain to me why the overflow flag, V=1, using the asr instruction on following binary number: %1111 0100 the asr shift would be; %1111 1010 V=1 another example %0000 0001 the asr shift would be; %0000 0000 why does V=1 I …

I'm new to assembly language and have written an instruction sequence for the MC68HC12 ,to input a string of characters using the SCI channel 0. The input character string, will be no more than 20 characters, and will be stored in memory when an EOT character is received. Port A …

I'm writing a program to output a stair step waveform from VoutA. How do I tell PORTP to output 2 volts? [code]#include "d:\miniide\hc12.inc" org $1000 ldaa #$FF staa DDRP ; configure PORTP for output ldaa #$6F staa DDRCAN ; configure PCAN6..PCAN5 for output bclr PORTCAN,$20 ; select VOUTA output xx …

I am new to assembly programming. I am programming for the MC68HC12. I was given a program with the opcodes XDECI, SR, Xprnt etc. I can't find any of these in my text book for the MC68. Are they for another processor, when I try to compile in CodeWarrior every …