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Discussion Groups | 68HC12 | Can Debugger makes slow the application?

Join our technical discussions about Freescale Microcontrollers: M68HC12. (Freescale Semiconductor is a Subsidiary of Motorola).

Can Debugger makes slow the application? - mas - Jun 11 5:27:00 2002

Hi All,
In our project, we are using 68HC812A4 processor. From serial port 0(serial interrupt is enabled), communication is running with modem in XMODEM protocol. During testing of our application from the 68HC812A4, I am keeping ICD12Z debugger ON via P&E BDM cable. When Debugger is ON, sometime processor is missing character coming on serial port 0 from modem. If I keep Debugger OFF, then processor is not missing any character on serial port 0.
 
Can Debugger make the execution speed slow when it is on?
 
Thanks,
Mansukh Sheliya


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Re: Can Debugger makes slow the application? - Dave Perreault - Jun 11 13:00:00 2002

Mansukh

The processor should run at full speed when doing a "GO" command
in BDM mode. The only possible exception I know of is if you are
using the real time variable window to look at memory locations
while the processor is running. In this case, in order to read memory,
the BDM looks for 256 memory cycles to try and find an unused
one. If not, the BDM steals a cycle to do the memory read. This,
however, should only make a small impact on execution speed.

Another thing to look at is the fact that when running under BDM,
the processor is placed in Special Mode. This means that certain
registers can be written which are not writeable in Normal Mode.
It could be that you code may cause some setup difference
under this circumstance.

Regards
Dave Perreault
 

mas wrote:

Hi All,In our project, we are using 68HC812A4 processor. >From serial port 0(serial interrupt is enabled), communication is running with modem in XMODEM protocol. During testing of our application from the 68HC812A4, I am keeping ICD12Z debugger ON via P&E BDM cable. When Debugger is ON, sometime processor is missing character coming on serial port 0 from modem. If I keep Debugger OFF, then processor is not missing any character on serial port 0. Can Debugger make the execution speed slow when it is on? Thanks,Mansukh Sheliya


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msCAN12 questions - Paul Johnson - Jun 11 15:12:00 2002

The Motorola documents describe much of the msCAN12 details in a
self-referential way. For example, Bus Timing Register 0 (CBTR0) sets the
Synchronization Jump Width, and includes a table showing the possible
settings. Unfortunately, I cannot find any information on the implications
of using different settings. There are a number of timing related registers
which are equally ambiguous.

Is there another tutorial, example or reference someone could suggest for
setting up msCAN between two 912's? Does anyone here have experience they
would be willing to share?

Thanks,

Paul



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