Messages

Yes, I think so. ICP is a reliable tool. I use my MCB900 with prog90x.hex, and I did an ICP bridge board, it contains a PLCC28 socket and a few circuit which I referred the ICPBridgeVddSwitch.pdf page5. While I want to program the chip, I put the chip on the bridge board and insert the board on the MCB900, then do programming.

However, I may merge the ICP bridge circuit with my circuit, and use a cable to connect my MCB900. I think this way is easy to develop for me.

Thanks,
kt_chen

Hi Andy,

I do not know what was happening at that time. I try to duplicate the same problem on the same chip, but I still can not duplicate this problem. However I never used the Start Bootloder feature on this chip, I am not sure that whether the booloader have been corrupted.

Thanks,
kt_chen

Hi Joe and Andy,

I have solved this problem. The root cause is the ISP code was broken. I guessed while I did change it to external crystal mode, the ISP code was broken. So after that time, it could not be into ISP mode.

How did I find this root cause? I tried to use ICP and successfully changed back to internal RC. After changing back to internal RC, I tried to let it into ISP mode again but it still failed. So I guessed the ISP code has broken, and I programmed it the new ISP code by ICP. After programming, it can be into ISP mode. Even I change to external crystal mode, it also can be into ISP mode. So I think the broken ISP code is th root cause.

Finally I thank for your helps very much.

Thanks,
kt_chen

Hi Joe,

Yes, my LPC932A1 can execute the code which I programmed before I changed to crystal mode, but I can not get it back in to programming mode now.

Actually, I let my MCB900 as a programmer. So I use my MCB900 to program the LPC932A1, then move it to my circuit.

However this LPC932A1 can work well on my circuit except on MCB900. I am also sure that my MCB900 is good, because I have tried the other chip and it can do proramming. But I am afraid that it will occur the same problem, I do not try external crystal mode with the new chip again.

However I will try to measure some of signals which you suggest.

Thanks,
kt_chen

Hi Andy,

I have tried item 13 of the list, but no any code is sent. So I tried again with the other new chip which is set using internal RC, it can send a code, but the code is not "U" or "?". It is like "".

Thanks,
kt_chen

Hi Andy,

Yes, I did. I have tried 2400bps, 4800bps, and 7200bps.

Thanks,
kt_chen

I have a MCB900 and I use LPC932A1. Originally, I set the LPC932A1 to use internal RC osciilator and it works well. Because I want to improve performance, I change to "High Frequency Crystal/Resonator(4MHz - 12MHz) and put a 12MHz crystal with two 22pF capacitors on the MCB900. After changing, it also can works well, but it can not connect with  the Flash Magic. Even I use 4MHz Crystal and osciilator, it still can not connect with the Flash Magic. Is my LPC932A1 damaged?

Thanks,
kt_chen