SPMCK16Z4MPV20 datasheet(477/500 Pages) FREESCALE

477 / 500 page

M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-25

AIX

#$01

;increment IX to point to the next byte

BRA

SEND_STRING

;loop back and do next byte in string

STRING_DONE:

;subroutine to implement delay between messages

LDE

#$FFFF

;load accumulator E with the delay time

STE

0,Z

;set up the counter

LOOP:

DECW 0,Z

;decrement the counter

BNE

LOOP

;count down to zero

RTS

;finish delay loop go back to main

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

STRING

'I AM A HAPPY EVB16 RUNNING YOUR CODE!!!',0A,0D,00

*****

Interrupts/Exceptions

*****

BDM: BGND

;exception vectors point here

;and put the user in background debug mode

*****

Reserve data and stack space

*****

ORG

$10000

;start of 1K internal SRAM for data & stack

COUNTER DS

;space for delay counter

E.2.4 GPT Programming Example

The following programming example involves demonstrating basic general-purpose

timer module (GPT) functions.

Refer to SECTION 11 GENERAL-PURPOSE TIMER for more information on the

GPT.

E.2.4.1 Example 7 - Basic GPT Functions

Description : This program demonstrates some basic GPT functions.

The 1st demo requires that the pins OC2, IC1, IC2,

and IC3 be tied together so that OC2 may drive

IC1, IC2, & IC3.

* In the second demo, the PAI pin should be connected

to the PWMA pin.

A bell on the dummy terminal

will ring when the Pulse Accumulator Counter

Freescale Semiconductor, Inc.

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SPMCK16Z4MPV20 Datasheet(PDF) 477 Page - Freescale Semiconductor, Inc

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