Motorola USB08 Betriebsanleitung PDF herunterladen (Seite 81)

APPENDIX B - HARDWARE

This diagram shows the basic set-up needed for Xplor8 to communicate with the MCU, to allow

Xplor8 to reset the MCU remotely, and possibly make use of the mode switch output.

NOTE: NOT TO BE USED FOR CONSTRUCTION. This diagram is a notional schematic only;

intended to illustrate the intent of the various components. Please see the circuit diagrams and pin and

voltage information published in the Freescale data sheet for the particular MCU that you are using.

I am also not suggesting that electro-mechanical relays are actually used to realize the circuit - once

again they are there to indicate an intent.

Notes:

1. The most basic setup is PTA0 connected via the simple duplexing circuit of resistors R1, R2

and diode D1 to a level-shifting chip such as a MAX232. See any HC908 data sheet, and

Freescale Application Note AN2317: “Low-Cost Programming and Debugging Options for

M68HC08 MCUs”

2. None of the other connections needed for a fully operational MCU are shown - any

development board should provide the necessary supporting circuitry. In particular certain port

pins will need to be pulled up/down at reset - see the data sheet for the MCU that you are

using.

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Motorola USB08 Betriebsanleitung Seite 81