Motorola Axiom CMD11E1 Uživatelská příručka stáhnout pdf (Strana 13)

1.2. TASKS 13

(b) Find out the ascii codes for the letters in the phrase THIS CLASS IS

FUN. To get you started, here are some codes: code for ’T’ is 54, code

for ’H’ is 48 and code for I is 49.

the last ASCII code, enter the special code 04.

(d) Run the program and write down what output you get.

(e) To see why you need the special code, do memory modify and change

it to 0A. Rerun the program and write down what you observe.

1.2.7 Entering your program: Using assembler

In this method, we will do all the work on the PC and eventually transfer the

program to HC11. Start any text editor. DO NOT USE A WORDPRO-

CESSOR such as Word, Wordpad etc. The best editor I am aware of the Pro-

grammer’s ﬁle editor (PFE). This editor is part of the lab package that you can

download from the web. Create a directory/folder where you will do all your work.

In that directory, copy all the ﬁles from the lab pack.

Using the editor, create a ﬁle called PROG1.ASM and enter the following

*Name: your name goes here

*Uniqname: Your unique name goes here

*Class: ECE 373 (or your course number)

*Term: The term

*Date: Date you started the code

ORG $C000 *this determines where the code will be stored

LDAA $D000

ADDA $D001

ADDA $D002

STAA $D003

SWI

Save your ﬁle. Start a MSDOS. Change directory to where your ﬁles are stored.

Execute the command

ASM PROG1

If there are no errors, you should see two new ﬁles, PROG1.LST and PROG1.S19.

The ﬁrst ﬁle for humans to read and is often called the LST ﬁle and the second

is for the HC11 and is called the S19 ﬁle.

Go back to the BUFFALO prompt and type the command

By tradition, assembly language programs are written in UPPERCASE letters, except if

you are writing code for Unix and its derivatives.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 100 101

Žádné komentáře

Motorola Axiom CMD11E1 Uživatelská příručka Strana 13