SPMCK16Z4MPV20 datasheet(475/500 Pages) FREESCALE

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M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-23

E.2.2 CPU16 Programming Example

The following programming example involves using the CPU16 indexed and extended

addressing modes.

Refer to SECTION 4 CENTRAL PROCESSOR UNIT for more information on the

CPU16.

E.2.2.1 Example 5 - Indexed and Extended Addressing

Description : This program demonstrates indexed and extended

addressing.

*****************************************************************************

****

INCLUDE

'EQUATES.ASM'

;table of EQUates for common

INCLUDE

'ORG00000.ASM'

;initialize reset vector

INCLUDE

'ORG00008.ASM'

;initialize interrupt vectors

ORG

$0200

;start program after interrupt vectors

*****

Initialization Routines

*****

INCLUDE

'INITSYS.ASM'

;initially set EK=F, XK=0, YK=0,

ZK=0

;set sys clock at 16.78MHz, disable

COP

INCLUDE

'INITRAM.ASM'

;initialize and turn on SRAM

;set stack (SK=#$1, SP=#$03FE)

*****

Start of main program

*****

LDAB

#$00

TBZK

;point ZK to bank 0

LDZ

#$FFFE

;set IZ=#$FFFE

OFFSET

EQU

$02

;SET OFFSET = $02

LDAB

#$01

TBEK

;point EK to bank 1

GO:

LDAA

#$00

STAA

$0000

;write 00 to $10000 (extended)

LDAA

#$FF

STAA

OFFSET,Z

;write ff to $10000 (indexed)

BRA

*****

Exceptions/Interrupts

*****

BDM:

BGND

;exception vectors point here

;and put the user in background mode

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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