SPMCK16Z4MPV20 datasheet(466/500 Pages) FREESCALE

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INITIALIZATION AND PROGRAMMING EXAMPLES

M68HC16 Z SERIES

E-14

USER’S MANUAL

STAB DDRF

;Port F pins 0-7 as outputs (force 3-7 to 0)

LDAB #$01

LDAA #$00

*****

Main Loop

*****

START:

STAB PORTF0

;store counter into Port E data register

STAA PORTF0

;load A register with Port F data register

BRA

START

;go back and start the counting again at zero

***** Exceptions/Interrupts

*****

BDM:

BGND

;exception vectors point here

;and will put user into background mode

E.2.1.2 Example 2 - Using Chip-Selects

Description : Demo of how to set up the U1 and U3 RAM slots with

two 32Kx8 RAM chips using the Chip Selects.

The new

memory will start at address $30000 and will be both

byte and word readable/writable.

This program assumes that the RAM to be installed

(such as MCM60L256AP85 or MCM6206P85) have

access times of 85 ns and require no wait states.

The DSACK field of the Chip Select Option Registers

may need to be adjusted for chips that have faster or

slower access times.

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

INCLUDE

'EQUATES.ASM'

;table of EQUates for common register

addresses

INCLUDE

'ORG00000.ASM'

;initialize reset vector

INCLUDE

'ORG00008.ASM'

;initialize exception vector table

ORG

$0200

;start program right after vector table

*****

Initialization

*****

INIT:

;Initialization stuff.....

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 1k internal SRAM at $10000

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

INCLUDE

'INITSCI.ASM'

;set SCI baud rate at 9600 baud

;enable SCI transmitter and receiver

CSINIT:

;Initialize the Chip Selects.....

LDD

#$0303

STD

CSBAR0

;set U1 RAM base addr to $30000: bank 3, 64k

STD

CSBAR1

;set U3 RAM base addr to $30000: bank 3, 64k

LDD

#$5030

STD

CSOR0

;set Chip Select 0, upper byte, write only

Freescale Semiconductor, Inc.

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SPMCK16Z4MPV20 Datasheet(PDF) 466 Page - Freescale Semiconductor, Inc

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