The micro is a philips P89C51RC.In-application programming instructions are activated by a BOOTROM area. There is also a security bit that can be set to keep from erasing the flash. It seems to me that it would be more likely that RAM is being corrupted causing a block erasure. I am also certain...
Kieth and Gunnar, thanks for your reply.
To answer your questions:
The flash has a boot rom which can allow in application programming. I'm going to bring this up again with the CTO.
Our station controller was basically a 3 speed fan controller. It pulled on a different relay for the...
The wire connection is portable cord. There is actually two microcontrollers in the system. The local board receives a command from a station 10ft away(the second micro which is being corrupted). There is 500 hundred of these systems running. And at least 1 fails a day. Failure meaning that the...
The basic setup is a microcontroller that is providing a 0 - 10 DC voltage level to the VFD. The VFD is connected to a 120VAC fan motor (small horsepower). The problem that is occuring is the flash memory in the microcontroller is getting corrupted. Reprogramming the device corrects the...
