SPMCK16Z4MPV20 datasheet(467/500 Pages) FREESCALE

467 / 500 page

M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-15

LDD

#$3030

STD

CSOR1

;set Chip Select 1, lower byte, write only

LDD

#$0303

STD

CSBAR2

;set Chip Select 2 to fire at base addr $30000

LDD

#$7830

STD

CSOR2

;set Chip Select 2, both bytes, read and write

LDD

#$3FFF

STD

CSPAR0

;set Chip Selects 0,1,2 to 16-bit ports

*****

The Main Program

*****

MAIN:

;Move data from another place in memory

;into the U1 and U3 RAM slots.....

LDAB

#$00

TBXK

;set XK to bank 0 for access to the STRING

LDX

#STRING

;load the starting address of STRING into IX

LDAB

#$03

;set ZK to bank 3

TBZK

;for access to U1 & U3 during write in XLOOP

LDZ

#0000

;clear IZ so ZK:IZ = $30000

XLOOP:

LDD

0,X

;load two bytes from $10000 into accum. D

STD

0,Z

;store accum. D into U1 and U3 RAM:

;the chip select logic takes care of us!

AIX

;increment X index register to next word

AIZ

;increment Z index register to next word

CMPA

#$00

BEQ

;end xloop if the end of the string $00 is

CMPB

#$00

;detected in either accumulator A or B

BNE

XLOOP

PRINT:

;This loop reads its string from the U1 and U3

;slots and prints it at the dummy terminal....

LDAB

#$03

TBXK

;set XK:IX index to point to bank 3

LDX

#$0000

;point to the beginning of the ASCII string

JSR

SEND_STRING

;go output the ASCII string

BRA

;loop back and print again

*****

Subroutines

*****

SEND_STRING:

;subroutine to send out the entire ASCII

;string

LDAB

0,X

;get next char in string as pointed to by IX

BEQ

STRING_DONE

;if B=00, then message is done

JSR

SEND_CH

;go send out a character

AIX

;increment IX to point to the next ASCII char

BRA

SEND_STRING

;loop back

STRING_DONE:

RTS

;go back to whence we came

SEND_CH:

;subroutine to send out one character at a

time

LDAA

SCSR

;read the SCI status reg to check TDRE bit

ANDA

#01

;check only the tdre flag bit

Freescale Semiconductor, Inc.

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Go to: www.freescale.com

SPMCK16Z4MPV20 Datasheet(PDF) 467 Page - Freescale Semiconductor, Inc

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