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Paul: I see the 82mA figure you quote, but suspect that is the current draw the SX itself requires. Evidence: At 4Mhz the spec is 8mA. My guess is that the system does not need to be limited to 8mA...

allanlane5: I do not see where I asked how to limit the current to a particular level.·I am (was) trying to clarify the spec sheet for the SX. I am not "unaware of the dependencies between current,...

Thanks for the replies. I am really trying to understand the specs sheet and operation of SX rather than solve a specific problem. I don't actually have an application with 20 LEDs in mind.

Am I...

I have a quick question about the DC characteristics of the SX chip:

According to the specs, the max current into Vss pin is 130mA, and max current out of Vdd is 130mA. Max·sink current per IO pin...

Ah, great. Thanks a lot, Bean!

Thanks for the replies.

So on the Code - List file, I have at the last line on the page the numbers: 841· 0315· 000D

The first number (841) increments with each line of...

Ok, this is perhaps an idiot question but I am unable to find out how much program·memory is remaining. I see that the SX has 2k of program space, but can't find out how much I have left with my...

Thanks a lot Guenther; your explanation was really useful to me! It also helped simplify my code a lot.·http://forums.parallax.com/images/smilies/smile.gif·

Ok, Bean, thanks. For some reason that doesn't seem to be clearly stated in the manuals I've read...

???

I am using a 50Mhz clock, and do know how to set the prescaler. If I'm okay with interrupts occuring at the rtcc rollover rate (20.48us with 1:4 prescaler), then I don't need to mess with...

Hello guys,

I'm trying to figure out how to correctly set the offset for retiw. I've read the manual, beg program guide, and searched this site and sxlist and can't quite figure out how to...

Hey, that's a good idea. More on that thought, a watch battery should work too. I kind of got interested in the 128bit serial EEPROM I found at Mouser, though; I think I'll play around with...

Thanks a lot for the input. I was hoping the state of the registers·was somewhat persistant when turned off :) but I'll have to decide on either an EEPROM or perhaps an analog trimmer. I think 16 dip...

Hi guys, I'm new to the microcontroller scene, having just found out about and picked up my SX28AC development kit last Friday. I'm trying to build a frequency counter for production, and when the...