P89LPC908 and ICP

[rbtamd]

Hi folks, anybody knows how P89LPC908 enters to the ICP mode?
I have a LPC908 based board and I use the MCB900 modified to do the bridge. Sometimes when I try to program the device flash magic doesn't recognize the signature, then I must to power up again. I want to reduce this problem.


Thanks

Roberto Mu

[Andy Ayre]

What does Flash Magic read for the signature when it doesn't recognize it? If it is all FFH then that indicates the device is not going into ICP mode. Something could be marginal, perhaps glitches or ripple on the power supply?

[rbtamd]

Hi Andy, yes it is all FFH. I do not understand why this is a random failure. I use NPN and PNP array to power the target board with 3.3 V. I suggest you add a button in the tool bar to read the device signature.


Thanks

Roberto Mu