SPMCK16Z4MPV20 datasheet(468/500 Pages) FREESCALE

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INITIALIZATION AND PROGRAMMING EXAMPLES

M68HC16 Z SERIES

E-16

USER’S MANUAL

BEQ

SEND_CH

;if TDR is not empty, go back to check it

again

CLRA

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 one character

*****

Exceptions/Interrupts

*****

BDM:

BGND

;exception vectors point here

;and put the user in background mode

*****

The string

*****

ORG

$0310

STRING

DC 'I LIKE MY NEW MEMORY!!!',0A,0D,00

E.2.1.3 Example 3 - Changing Clock Frequencies

Description : This program demonstrates the ability of the

M68HC16 to change clock frequencies on the fly.

In this particular case, we alternate between

a frequency of 16.78MHz and 4.194MHz.

Note

that because we are writing to the screen,

we also need to correct the BAUD rate (1200)

each time we change the frequency.

Make sure

that your terminal has been set up to receive

at 1200 baud.

An oscilloscope may be connected

to the CLKOUT pin on the EVB to observe the

frequency change.

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

INCLUDE

'EQUATES.ASM'

;table of EQUates for common registers

INCLUDE

'ORG00000.ASM'

;initialize reset vectors

INCLUDE

'ORG00008.ASM'

;initialize interrupt vectors

ORG

$0200

;start program after the 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 1K SRAM at $10000

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

LDD

#$000C

Freescale Semiconductor, Inc.

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