In SX Microcontrollers, SX/B Compiler and SX-Key Tool, dkemppai wrote:

[quote="Paul Baker"]
As you obviously know, the OSC2 signal is the problem. I am nearly certain that the OSC2 is used by the SX-Key as a return signal from the SX. Have you tested the continuity of the trace between the OSC2 pin on the SX-Key header and the OSC2 pin on the SX? What else besides the resonator is connected to the OSC2 line? Are you using a parallel resistor between OSC1 and OSC2?


 

 

I have checked continuity between all pins on the SX-Key and the chip. I cut the shrink tube off the key near the connector and checked from connector soldered to the Key. +5V, Gnd, OSC1, and OSC2 appear to be connected. When programming, I don't have anythign except the SK-Key attached. No resonator, no resistors, just the key. 

 

I'm pretty sure that the OSC2 is a bidirectional signal. OSC1 only provides the high VCC required to program the Flash memory. The communications go back and forth on OSC2...   ...but I need to check the specs to be sure. For some reason, that pin won't go high. But, this only happens when the SX-Key was programmed to run the oscillator. Weird!

 

I'm starting to wonder if it's an intermittent connection in the SX key connector. The last time I tried to program, it failed in the middle of a programming cycle. And several times the chip connection failed, and then the SX-Key software lost the connection to the SX-Key! That seemed really odd. 5 volts is good, and MCLR is very stable.   

 

 

I'll keep hammering on it. 

I will try a different key tomarrow morning. It's getting to the point that I need a stiff drink tonight!

 

 :freaked:  

-Dan

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