A couple of beginner questions about the Propeller.

John Michael

I am brand new with the propeller and have a question about line levels. I have prototyped a sample circuit with a 44-pin prop and an eeprom as shown in the prop manual. It shows BOEn tied Low with Vss and states that BOEn is active low, I see that this makes RESn an output and assume that BOEn should remain low for normal operation. I am using the prop clip for an interface so I assume after dumping the program into the eeProm the RESn line remains in a high state due to an internal pull-up...
Am I understanding this right?
Also I am using a 3.3 Volt (100 ma.) booster circuit to supply Voltage to the Chip via a AAA battery "I only have two LED's attached to the chip for a simple test circuit but experiencing burnout problems with my booster IC. after about 4 or 5 dumps into the eeProm ... Any suggestions?
Is there a way that I can monitor a single step through sequence to make sure that my circuit is working the way it should? The software is seeing my prop on com5 but my LED'S are not blinking the way the program is telling it to. I am using the internal Slow Clock mode ...

John.

kwinn

You seem to be understanding it correctly. From the Propeller manual:

"BOEn is a Brown Out Enable (active low). If it is low, RESn becomes a weak output (delivering VDD through 5 KΩ) for monitoring purposes but can still be driven low to cause reset. If high, RESn is CMOS input with Schmitt Trigger."

In both cases (BOEn high or low) RESn going low will reset the prop. With BOEn high RESn is an input, with BOEn low RESn is like an open collector pin with a 5K pullup.

For your power issue I would suggest a wall wart and a 3.3V regulator. If you must use batteries I would suggest rechargeable AA rather than AAA. The booster chip may be drawing excessive current as the AAA battery voltage decreases when nearing fully discharged.

There are several debuggers available in the OBEX for spin and PASM.

John Michael

Thanks for your help, I found the Viewport software and it looks to be excellent for monitoring purposes. In my application I have to use a AAA battery, they make a 200 ma version I may try it.
Have you ever used viewport?

John.