SPMCK16Z4MPV20 datasheet(471/500 Pages) FREESCALE

471 / 500 page

M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-19

ORG

$0200

;start program after interrupt table

*****

Initialize

*****

INIT:

;initialization stuff

TEMP

EQU

$0006

;variable space used in hex to asc routine

SCCNT

EQU

$0004

;stores the current number of seconds

MNCNT

EQU

$0002

;stores the current number of minutes

HRCNT

EQU

$0000

;stores the current number of hours

INITSYS:

;The following section is normally part of

;INCLUDE 'INITSYS.ASM', but we want to

;leave the COP on.

LDAB

#$0F

TBEK

;point EK to bank F for register access

LDAB

#$00

TBXK

;point XK to bank 0

TBYK

;point YK to bank 0

TBZK

;point ZK to bank 0

LDD

#$00CF

;initialize the SIM MCR

STD

SIMMCR

;this is redundant; it happens at reset

LDAA

#$7F

STAA

SYNCR

;set system clock to 16.78 Mhz

LDAB

#$C0

STAB

SYPCR

;enable the watchdog (COP)

;and set time-out period to 8 seconds

INCLUDE

'INITRAM.ASM'

;turn on internal SRAM at $10000

;set stack in bank 1 (SK=1, SP=03FE)

INCLUDE

'INITSCI.ASM'

;set SCI baud rate at 9600 baud

;enable SCI transmitter and receiver

LDD

#$0638

STD

PICR

;set the periodic interrupt at request level 6

;& assign vector #56 (address $00070) to it

LDD

#$0110

STD

PITR

;initialize PITR to interrupt every 1 sec

LDD

#$FFF9

;initialize Chip Sel Base Reg for Autovector

STD

CSBAR3

;on an IACK cycle: A24-A11=$FFF8, blK_sz = 8K

LDD

#$7801

;initialize Chip Sel Option Reg for

Autovector:

STD

CSOR3

;asynchronous, any Interrupt Priority Level

LDAB

#$FF

;set port F pins to be IRQ pins

STAB

PFPAR

;this is redundant: it happens at reset

LDAB

#$01

TBZK

;set zk nibble to bank 1 for variable access

LDZ

#$0000

;index those variables from $10000

LDD

#$0000

STD

SCCNT,Z

;clear sccnt register

STD

MNCNT,Z

;clear mncnt register

STD

HRCNT,Z

;clear hrcnt register

STD

TEMP,Z

;clear “save” variable space

LDAB

RSR

;find out who caused the last reset

Freescale Semiconductor, Inc.

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SPMCK16Z4MPV20 Datasheet(PDF) 471 Page - Freescale Semiconductor, Inc

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