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Lpc2000

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Message

several questions regarding lpc2xxx functions

2005-07-15 by Thomas

hello,
we are planning to use the lpc2xxx family in some of our products.
now i check if the lpc2xxx family fulfills all of our requirement.
i am new to the lpc2xxx family but have already studied several
manuals and faq's.

reading all of these documents some questions arised:

1) software breakpoints
obviously the ARM Embedded ICE supports up to 2 hardware breakpoints.
how does it look with software breakpoints in flash memory? is this
possible?

2) wake-up-timer
the wake-up-timer is mentioned in the 213x datasheet but there is no
hint how long this timer is running until the controller is starting
to run. what time can i expect?

3) removing of clock
the faq on the philips homepage says, that the pll is not longer
working in the case the clock is removed (e.g. crystal is defect).
because the watchdog-timer depends from the clock the watchdog will
not reset the lpc2xxx. Is this correct until now?
so if i would like to have a well defined situation (=reset) in this
case i have to use an external watchdog chip. Is this correct?
if the pll is not longer running and the exterenal watchdog makes a
reset will the port pins be switched to input as they are in normal
reset state?

many thanks in advance for answerring my question
thomas

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