topic Re: unknown processor in 8-bit Microcontrollers

unknown processor

Tony19 — Mon, 29 Mar 2010 18:45:12 GMT

Hi Guys, trying to re-write eeprom on this chip, but cant find the type?.

Its:- KQQMC9543D

I've got most interfaces etc to get into most chips in this era, but bogged down a bit here.

Thanks in anticipation.

Re: unknown processor

Tony19 — Tue, 30 Mar 2010 20:31:00 GMT

Oh dear no response. I've had another look, its 68 pin type looks to be running at 12 mhz. Pins seem to be same as 68HC11 txd, rxd, xtal pins are the same. no-one?

I'll have to put a 4mhz xtal in there and try something.

Re: unknown processor

bigmac — Wed, 31 Mar 2010 02:33:20 GMT

Hello, and welcome to the forum.

This component does not follow the normal nomenclature for 8-bit MCUs. It is possible that it may be a proprietry device manufactured for a specific customer. It is also quite possible that the device may not be re-programmable.

Regards,

Mac

Re: unknown processor

Tony19 — Wed, 31 Mar 2010 15:12:03 GMT

Thanks for then input Mac, its in a cars ecu, so the eeprom should be programmable/erasable. my software works mainly on 4 & 8 mhz clocks, so I'll try a crystal change.

Tony