HC12 Jtag

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Hey

Anyone have a design for a Jtag interface to a MC9s12NE64, it has to run 3v3
and 25Mhz..

it's not easy to use that much money as a student :(

Kasper



Re: HC12 Jtag
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3v3

you dont need to run at 25MHz, 25MHz is the maximum possible !!
just add 4 wires to printer port and that will do as well :)

antti
http://gforge.openchip.org




Re: HC12 Jtag

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Hej

Well when i have to make it work with the E-MAC/Phy in the uC i have to run
25Mhz to fit their speed and end up with 100mbit

but kan i run diferent speed on the jtag than the master clock ?

Kasper



Re: HC12 Jtag
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run

JTAG clock is TOTALLY ASYNC and totally independant !
from 0.01 Hz to the maximum supported by the JTAG port (this may be higher
then the max clock for the chip)

antti



Re: HC12 Jtag
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Hey again, sounds nice, do you have a link to a schematic there is easy to
build and will work ?

thanks

Kasper



Re: HC12 Jtag
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higher
please contact me per email snipped-for-privacy@truedream.org

antti



Re: HC12 Jtag
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3v3

actually you are totally mistaken. the NE64 does not have JTAG at all.
unless you are going to use NE64 as JTAG MASTER in what case
the speed is most likely irrelevant. in any case achiving 25MHz
sustained JTAG update in master mode is almost not possible
without dedicated JTAG master hardware.

but i assume you are talking about the BDM not JTAG?
for BDM yes the 25MHz is important that is dictating the bit timing

antti




Re: HC12 Jtag
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Heh, of cause it's a BDM.... can't figure out why i have exchanged these
words :(

Kasper



Re: HC12 Jtag

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Besides the elmicro.com ComPOD12, http://www.freegeeks.net/ describes
a really cheap BDM tool named TBDML.

Oliver
--
Oliver Betz, Muenchen (oliverbetz.de)

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