SPMCK16Z4MPV20 datasheet(476/500 Pages) FREESCALE

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INITIALIZATION AND PROGRAMMING EXAMPLES

M68HC16 Z SERIES

E-24

USER’S MANUAL

E.2.3 QSM/SCI Programming Example

The following programming example involves using a port of the serial communication

interface (SCI), one of the serial interfaces of the queued serial module (QSM), to dis-

play a message on a dummy terminal.

Refer to SECTION 9 QUEUED SERIAL MODULE for more information on the QSM

or the SCI.

E.2.3.1 Example 6 - Using an SCI Port

Description : This program uses the SCI port to display

a shameless message on a dummy terminal.

It includes

a subroutine to print a single character to the SCI

and a subroutine that uses the single character

subroutine to print an entire string.

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

INCLUDE

'EQUATES.ASM'

;table of EQUates for common register

addresses

INCLUDE

'ORG00000.ASM'

;initialize reset vector

INCLUDE

'ORG00008.ASM'

;initialize interrupt vectors

ORG

$0200

;start program after exception vector table

*****

Initialize

*****

INIT:

INCLUDE

'INITSYS.ASM'

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

;set sys clock at 16.78 MHz, disable COP

INCLUDE

'INITRAM.ASM'

;turn on internal SRAM at $10000

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

INCLUDE

'INITSCI.ASM'

;set the SCI baud rate to 9600 baud

;enable the SCI receiver and transmitter

LDAB #$00

TBXK

;set XK to bank 0 for STRING access

LDAB #$01

TBZK

;set ZK to bank 1 for delay counter access

LDZ

#$0000

;clear IZ for later use with delay counter

*****

Main Program

*****

MAIN

LDX

#STRING

;point to the beginning of ASCII string

JSR

SEND_STRING

;go output the ASCII string

BRA

MAIN

;branch back to main

*****

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 goto delay between messages

JSR

SEND_CH

;go send out the byte

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