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LPC9xx/LPC9xxx / p89lpc931 isp programming issue
May 29, 2014, 12:17:37 AM
I am using p89lpc931 in our board. I have the ISP circuit on our board exactly as it is on keil MCB 900 board. I am using flashmagic tool 6.80 version. I get auto-baud error all the time, and I have tried all sorts of options, and controller refuses to go into programming mode.

Btw, I am using USB-SERIAL convertor for connecting my PC and board. I have also connected and tried on another PC with COM port and I have the same issue. I tried to change the baudrate to lower and higher values. But the nothing seems to work.

I am attaching the image that shows the behavior of RST pin after hitting program button on FM.

I don't see a 3 pulses for some reason on RST pin. After couple of seconds, flashmagic gives the autobaud error and RST pin comes back 'Hi' level, as you can see in the image. Can someone through some light on this.

FYI: I am using the same flashmagic with USB-SERIAL convertor for LPC2362 controller and It works great for ISP programming.