SPMCK16Z4MPV20 datasheet(465/500 Pages) FREESCALE

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M68HC16 Z SERIES

INITIALIZATION AND PROGRAMMING EXAMPLES

USER’S MANUAL

E-13

E.2.1 SIM Programming Examples

The following programming examples involve using the system integration module

(SIM). The programs include:

• Using ports E and F.

• Setting up U1 and U3 RAM slots with two 32K X 8 RAM chips using chip selects.

• Demonstrating the ability of the M68HC16 to change clock frequencies on the fly.

• Demonstrating the software watchdog, the periodic interrupt, and an autovector.

Refer to SECTION 5 SYSTEM INTEGRATION MODULE for more information on the

SIM.

E.2.1.1 Example 1 - Using Ports E and F

Description : This program demonstrates a simple I/O usage of

Ports E and F with a loop that will load Port E

with a number, pass that number over to

Port F through a hardwire of the M68HC16Z1EVB, and then

read

that number from the Port F data register.

Port E will be incremented each loop.

The hardwire of the M68HC16Z1EVB is from DSACK0 to MODCLK,

from DSACK1 to IRQ1, and from AVEC to IRQ2.

The numbers start at #$00 and go to #$07.

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

INCLUDE

'EQUATES.ASM'

;table of EQUates for common register

;addresses

INCLUDE

'ORG00000.ASM'

;initialize reset vector

INCLUDE

'ORG00008.ASM'

;initialize exception vectors

ORG

$00200

;start program right after exception

;vectors

*****

Initialize

*****

INCLUDE

'INITSYS.ASM'

;initially set

EK=F, XK=0, YK=0, ZK=0

;set sys clock at 16.78MHz, disable COP

INCLUDE

'INITRAM.ASM'

;turn on internal SRAM at $10000

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

LDAB #$00

STAB PEPAR

;define the Port E pins as I/O pins

STAB PFPAR

;define the Port F pins as I/O pins

LDAB #$00

STAB PORTE0

;clear the Port E data register

STAB PORTF0

;clear the Port F data register

LDAB #$FF

STAB DDRE

;initialize Port E pins as outputs

;note that Port E pin 3 does not exist!

LDAB #$FF

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SPMCK16Z4MPV20 Datasheet(PDF) 465 Page - Freescale Semiconductor, Inc

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