Lpc2000

Piotr wrote:

> Few weeks ago I asked here (but not only here, in Philips
> Technical Support too) about JTAG commands used for Flash
> memory programming in LPC2K devices. In fact, nobody has
> given me complete answer. Similar problems I've had with
> STMicroelectronics Technical Support. Is there anybody who 
> know why uCs producers are so secretive? 

They aren't being secretive! It's just that the JTAG and Debug 
module interface come from ARM. You need (at least) the 
following documents from the ARM Tech Ref CD: DAI0028, DAI0038B 
and DDI0029G.

The manufacturers may well protect their Flash algorithms, and 
they may also not document all the JTAG scan chains, but at 
least for the LPC2xxx, once the JTAG unit has control, it can 
run the IAP routines.

For a different approach to JTAG for ARMs, see:
  www.mpeforth.com/jtagwidget.htm

Stephen

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Stephen Pelc, stephen@...
MicroProcessor Engineering Ltd - More Real, Less Time
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