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Topics - Mariano D

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LPC9xx/LPC9xxx / ICP problems on custom board
« on: March 22, 2007, 06:25:14 am »
Hi All, I'm trying to make my own programmer board, for the LPC932A1, and use it in ICP mode.

The board is very similar to the MCB900 from keil, I make it following all the recomendations that I found on the AN's and this forum.

Up today I'm able to make all the functions in ISP mode (read, write, erase & set device configuration).

When I trying to use it as ICP (with the ISP-ICP bridge device on it) I can only use it for read, blank check, erase, read device ID & set device configuration, but I can't program the device.

Is necesary connect some other pin on the LPC932 that I'm using as bridge. Because if I use the original MCB900 board with this device I'm able to make all the functions on ISP & ICP.

If I didnīt undestand wrong, for ICP only need to connect TXD RXD to the bridge device and the five pins to the target.
The circuit for control the target VDD pin on the AN10258 doesnīt work properly, Iīm using a PNP & NPN transistor arrengement that works well.

Someone can advice me?

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