SPMCK16Z4MPV20 datasheet(472/500 Pages) FREESCALE

472 / 500 page

INITIALIZATION AND PROGRAMMING EXAMPLES

M68HC16 Z SERIES

E-20

USER’S MANUAL

CMPB

#$20

BNE

NO_DOG

;choose which string start address to load

LDX

#DOG_STRING

;COP caused the reset

BRA

NO_DOG: LDX

#NO_DOG_STR

;COP did not cause the reset

PRINT:

JSR

SEND_STRING

;print the string to the screen

ANDP

#$FF1F

;set interrupt priority mask level to 0

*****

The Main Program

*****

MAIN:

NOP

BRA

MAIN

;keep on looping until watchdog causes a reset

;or we get some other interrupt

*****

Subroutines

*****

SEND_STRING:

;subroutine to send out the entire ASCII

string

LDAB

0,X

;get next byte in string as pointed to by IX

BEQ

STRING_DONE

;if B=00, then we're done

JSR

SEND_CH

;go send out the byte

AIX

#$01

;increment IX to point to the next byte

BRA

SEND_STRING

;loop back and do next byte in string

STRING_DONE:

RTS

;go back to whence we came

SEND_CH:

;subroutine to send out one byte to SCI

LDAA

SCSR

;read SCI status reg to check/clear TDRE bit

ANDA

#$01

;check only the TDRE flag bit

BEQ

SEND_CH

;if TDR is not empty, go back to check it

again

LDAA

#$00

;clear A to send a full word to SCDR ($FFC0E)

STD

SCDR

;transmit one ASCII character to the screen

TC_LOOP:

LDAB

SCSR+1

ANDB

#$80

;test the TC bit (transfer complete)

BEQ

TC_LOOP

;continue to wait until TC is set

RTS

;finish sending out byte

*****

The STRINGs

*****

DOG_STRING

DC 'The Software Watchdog just caused a reset!',0a,0d,00

NO_DOG_STR

DC 'The last reset was not caused by the COP.',0a,0d,00

AUTOV_STRING DC 'Feeding the dog...',0a,0d,00

*****

Periodic Interrupt Vector Routine

*****

VECRT:

;When the processor is interrupted by the

;periodic timer, it will run this routine.

;This routine simply increments a clock

;every time it is interrupted, and prints

;the clock out on the dummy terminal.

SECONDS:

;advance the counter for seconds

Freescale Semiconductor, Inc.

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