Motorola Axiom CMD11E1 Uživatelská příručka stáhnout pdf (Strana 52)

52 CHAPTER 4. PROGRAMS

pseudo language, I will use a C like syntax

. The program we want to write should

be similar to the following C program (since HC11 is essentially an 8-bit micro,

all variables will be unsigned chars to keep things simple).

#include <stdio.h>

unsigned char v1, v2, v3, v4; unsigned char

total; main() {

v1 = 11;

v2 = 0x2F; /* In C prefix 0x denotes HEX */

v3 = ’A’;

v4 = 044; /* In C prefix 0 denotes octal */

total = v1+v2+v3+v4;

printf("%02X", (unsigned) total);

return 0;

}

Compile and run the above program using any C compiler. The output of your

program should be 9F. Now assemble the following HC11 program, and run it to

verify that you get the same answer:

;Name: etc

;

; This program adds 4 numbers and prints the answer.

;

outlhlf equ $ffb2

outrhlf equ $ffb5

org $2000

main

; v1 = 11;

ldaa #11

staa v1

;v2 = 0x2f;

ldaa #$2f

staa v2

;v3 = ’A’;

ldaa #’A’

staa v3

This reverses history! C language was invented to avoid writing assembly code!

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Motorola Axiom CMD11E1 Uživatelská příručka Strana 52