SPMCK16Z4MPV20 datasheet(470/500 Pages) FREESCALE

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INITIALIZATION AND PROGRAMMING EXAMPLES

M68HC16 Z SERIES

E-18

USER’S MANUAL

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:

JSR

DELAY

;wait for a moment

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

LOOP5:

LDAB

SCSR+1

ANDB

#$80

;test the TC bit (transfer complete)

BEQ

LOOP5

;continue to wait until TC is set

RTS

;return to send_string subroutine

*****

The STRINGs

*****

STRING

'The System Clock is now running at 16.777 MHz...',0a,0d,00

SEC_STR DC

'check this out!',0a,0d,00,00

STRING2 DC

'The System Clock is now running at 4.194 MHz...',0a,0d,00

*****

Interrupts/Exceptions

*****

BDM:

BGND

;exception vectors point here

;and put the user into background debug mode

E.2.1.4 Example 4 - Software Watchdog, Periodic Interrupt, and Autovector Demo

Description : This program demonstrates the software watchdog,

the periodic interrupt, and an autovector.

The periodic interrupt runs a clock which is updated

on the dummy terminal.

Every eight seconds the COP

will force a reset unless IRQ6 is grounded.

When IRQ6

is pulled low, an autovectored interrupt routine will

“feed” the watchdog with $55 and $AA, and the

clock will run without being reset on the dummy terminal.

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

INCLUDE

'EQUATES.ASM'

;table of EQUates for common registers

INCLUDE

'ORG00000.ASM'

;initialize reset vectors

INCLUDE

'ORG00008.ASM'

;initialize interrupt vectors

ORG

$002C

;put address of autovector routine

DC.W

AUTOV

;at the level 6 vector (IRQ6)

ORG

$0070

;put address of periodic interrupt routine

DC.W

VECRT

;at 1st user defined interrupt vector

Freescale Semiconductor, Inc.

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