Motorola Axiom CMD11E1 Guide de l'utilisateur télécharger pdf (Page 12)

12 CHAPTER 1. INTRODUCTION TO HC11

>ASM C200

C200 STX $FFFF

>LDAA D000

B6 D0 00

C203 STX $FFFF

>ADDA D001

BB D0 01

C206 STX $FFFF

>ADDA D002

BB D0 02

C209 STX $FFFF

>STAA D003

B7 D0 03

C20C STX $FFFF

>SWI

C20D STX $FFFF

> CTRL-A

Note that to get out of the ASM command you need to type the control-A

character.

Exerecises

1. Enter the program shown above and verify that the program is entered

correctly.

2. Search through the memory starting at location $E000 to ﬁnd the string

User Fast Friend. On my HC11 it is at location E610. Yours may be

diﬀerent. Locate the string and ﬁnd out where the string is stored, i.e. the

address of the ﬁrst character. Modify the value E610 in what follows with

the address you found.

Enter the following program starting at location C300 and run it. What is

the result of running your code?

LDX #E610

JSR FFC7

SWI

3. (a) Modify the above program by changing E610 to D200.

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Motorola Axiom CMD11E1 Guide de l'utilisateur Page 12