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upside down bjts
In sample/hold circuits from bygone times, it was common to find a bjt upside-down. If, as an example, there was a capacitor that needed 'resetting', the bjt across it had, for an...
Tuesday, 7 June 2011 - 09:11
sleeping safely
I have a UC3B0256 board where I am trying to drop current consumption. Thus, I wish to sleep. In particular, I wish to sleep until the uart is almost done transmitting, so i have...
Friday, 25 June 2010 - 17:41
UC3 ADC throughput 15ck vs 13ck
On a UC3A0512 rev.I, I have one ADC channel enabled, conversion is triggered by a timer channel, and PDCA is taking the data away. This basically works. What I ran into is this in...
Saturday, 8 August 2009 - 13:13
evaluation order - C
suppose I have two volatile variables, a and b. And a simple statement: c=a-b; Which variable will be read first? I'm convinced, but can't find it written, that it's...
Friday, 23 January 2009 - 18:09
max clock before the prescaler UC3A0512
The hunt for a fpll-out limit for UC3A0512: In the datasheet fig.13-3 (PLL and optional divide by 2), the naming convention is: fvco is the raw output from the VCO, 80-240MHz....
Saturday, 2 August 2008 - 11:17
studio2: set correct libc?
The problem: I have retargeted the example ethernet project for the STK1100 (went into project properties, general, changed from 0512ES to 0512 in the combobox, then re-added the...
Wednesday, 16 July 2008 - 23:10
Power meter (design example)
In daqq's "home mini server" thread in the off-topic forum power measurements came up, and since this design does not include an AVR, I decided to do a blatant plug here. http://...
Wednesday, 26 March 2008 - 19:02
dragons, chicken and egg.
How about making the 'open platform options' checkbox non-grayed for Dragon? (to avoid the chicken-and-egg problem) Today I needed a third debugger, and attempted to use a Dragon...
Friday, 8 February 2008 - 19:23
USB, hubs, usbser.sys, and annoyance
I've brewed up a device loosely based on USBKEY, and it works. Mostly. In other words not well enough. Linux' driver treats it as CDC-ACM, which it is, gives me a proper device...
Saturday, 18 August 2007 - 20:47
AREF internal reference, and absolute max ratings
(This is mostly a heads-up. I did post design change inspection on a high volume product and found something that made me uneasy) I had to decide on a decoupling capacitor on AREF...
Wednesday, 6 June 2007 - 18:37
M168 internal bandgap impedance gotcha
I have a Mega168 running 14.7MHz, with the ADC set to /128 prescaler (=>113us conversion time), and have run into an undocumented 'feature': The BOD is on, and comparator bandgap...
Saturday, 25 November 2006 - 00:21
FIR in AVR
I posted a 71-tap 24ksps runtime-reconfigurable FIR project to the academy section, and as a companion to that there's a video of the thing working. Yes it's horrible german...
Wednesday, 29 March 2006 - 19:19

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