Motorola USB08 Betriebsanleitung PDF herunterladen (Seite 11)

2.5 Supporting Files

To be fully operational, Xplor8 needs access to various supporting files of information. These are:

1. A configuration file for each version of the HC908 MCU range. This file records such data

about the MCU as its memory map. Example name: 908QT1.cfg

2. Utility file(s) in standard Motorola S19 format to allow verification, programming and erasing

of FLASH memory. Example name: QTY_UT1.S19

4. A file of information on the CPU opcodes. Default name: HC08_Opcodes.csv

This file is used by the Unassemble, Go (Run) and Trace commands to establish and process

break points. It is a text file in comma separated value format prepared directly from

Freescale's published information on the binary codes for each mnemonic of their instruction

set. It may be examined with any text editor (and changed at your own risk!).

5. A file of information on the MCU I/O registers. Example name: Regs_908QT1.csv

This file is used by the Register Display and Change command, as well as internally by Xplor8.

These files have been prepared from the published Freescale documentation and may be

examined in any text editor.

A full listing of the files in the distribution is in Appendix H.

2.6 Remote Reset

Some target development boards allow remote control of the power supply to the MCU, so that a

power-on reset (an essential prerequisite to entering Monitor Mode) may be initiated by Xplor8. This

can save some time and frustration in program development. To make this possible, it is necessary to

run a wire from one of the COM port control pins, either DTR (Data Terminal Ready) or RTS (Ready

To Send) via some simple interface logic to control the MCU power supply; details are shown in

Appendix B - Hardware. When Xplor8 requires to reset the MCU, it toggles the polarity on the

appropriate pin. See Settings>COM Port for information on setting up the toggles. A remote reset

capability is a luxury - Xplor8 works perfectly well without it.

2.7 Monitor/User Mode Switching

With suitable circuitry on the target board, Xplor8 is able to make use of the spare COM port output

line (either DTR or RTS, whichever is not in use by remote reset) as a general-purpose logic output

to switch between monitor and user modes. If the circuitry is available (see Appendix B - Hardware),

then this option may be set up in Settings>COM Port, and activated using the right-hand speedbutton,

or by the Mode Switch command (page 52). For an example of the use of this facility, see Calibrating

the Internal Oscillator on .

2.8 Local and MCU-controlled Memory

The whole 64KB memory space of the MCU has its counterpart in a 64KB array of bytes within

Xplor8. I refer to the latter array as the local version of MCU memory. It may or may not be an exact

copy of the MCU memory, but is used internally whenever communication of memory contents with

the MCU is required. For example, a command to list MCU memory will initiate a request for the

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Motorola USB08 Betriebsanleitung Seite 11