No BDM-connection

[thommes]

Hello,

I'm using the Mc9s12d64 on a selfdesigned board. My Problem is, that i can't communicatewith the chip.

The NoICE-DEbugger reports the error:

"BDM validation failed: MODE=0xFF BDMSTAT: =xFF

This may indicate incorrect MOD setting (MODA and MODB must be grounded), that the pod cannot reset the target, or an incorrect bus speed setting"

I testet the Mod's anb both A and B are grounded.

When i start the communication the Reset-line goes low for 19,5ms then back to 5V, same with the BKGD-line! THe bus speed is set correct (16MHZ crystal => 8MHz Busspeedhttp://dict.leo.org/ende?lp=ende&p=DOKJAA&search=crystal&trestr=0x801). What can be the issue fpr this problem. The crystal also works fine (tested with oscillioscpoe). Can the microcontroller be broken? That would be the first time, this happened....

Please, please help me, because i have no more ideas where i can look for solutions.

Thanks and regards,

Thommes

[RadekS]

I am afraid that ComPOD12 is not directly supported under CW5.1.

CW5.1 offers these default connection options for S12D64:

Full Chip Simulation

P&E USB BDM Multilink

P&E Cyclone Pro (USB, Serial or TCPIP)

Softec HCS12

Abatron BDI

TBDML

HCS12 Serial Monitor

I believe that NoICE debugger should have some function for unsecure or at least some function for manual commands (for write to registers). In attachment you can find command file for unsecure procedure from CW. I hope that this command file is easy to understand (wb=write byte, ww=write word, syntax: wb address data)

[thommes]

Perhaps you can also tell me, WHY could the MCU be secured. I have never written any Code on the Chip....

[RadekS]

MCU can be accidentaly secured for example in case of violently termination during MCU programming.

There is security byte at address 0xFF0F. Default value is 0xFE. Any other value means that MCU will be secured after next reset. More details about security at S12(X) devices you can get from attached document.