Lpc2000

Robert Adsett wrote:

>You probably want an open drain reset device rather than a push-pull.  A 
>simple pullup will then provide the voltage to take the processor out of 
>reset.  As an added bonus you can also parallel reset sources.
>

I find that a device that can source the reset pin high after reset is 
more useful. This allows a pull-down resistor that ensures the reset 
line stays low even in abnormally low supply voltage conditions. Most 
reset chips don't do this but I find it practical to dedicate a small 
8-pin PIC12C629 for this job. It's about the same price as a reset chip 
(close enough), comes in very small packages, and includes all the 
brown-out detect and power-on timers etc. Besides being able to program 
the reset time I also include a coms monitoring routine that allows me 
to place the LPC into reset or program mode etc simply by entering a 
unique control string.

Peter Jakacki