SPMCK16Z4MPV20 datasheet(479/500 Pages) FREESCALE

479 / 500 page

M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-27

STAB

TMSK2

;& set the TCNT's prescale to sysclock/128

Set up Input Capture and Output Compare

LDAB

#$27

;Input Captures

STAB

TCTL2

;TIC1=either, TIC2=rise, TIC3=fall, TIC4=off

LDAB

#$01

;Output Compares

STAB

TCTL1

;TOC2=toggle, TOC3=off, TOC4=off, TOC5=off

LDD

#$1000

;set OC2 to toggle every time that

STD

TOC2

;TCNT is #$1000

Set up the Pulse Width Modulators A and B

LDD

#$0064

;set PWM prescaler to div by 128

STD

PWMC

;set PWMA fast (512 Hz)

;and PWMB slow (4 Hz)

LDAB

#$80

;set 50% duty cycle

STAB

PWMA

;in PWMA

STAB

PWMB

;in PWMB

Set up the Pulse Accumulator

LDD

#$5000

;set PAC to sense rising edges in

STD

PACTL

;event counting mode

Other Initializations

LDAB

#$00

TBXK

;set XK to bank 0 for STRING access

PAOV_CNT EQU

;counter variable for PAOV_ROUTINE

LDAB

#$01

TBZK

LDZ

#$0000

;PAOV_CNT will be indexed off ZK:IZ

LDAB

#$0A

STAB

PAOV_CNT,Z

;load a 10 into the variable

ANDP

#$FF1F

;set interrupt priority mask level to 0

*****

Start of main program

*****

GO:

NOP

BRA

;Let's loop until we're interrupted

*****

Subroutines

*****

SEND_STRING:

EVEN

;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 the string is 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

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