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Trying to avoid JTAG conflict with ATMEGA6450
I'm using the 6450 in an application that requires every single IO line, including the JTAG ones on port F.  Those particular pins read some DIP switches via the following...
Mon. Jul 3, 2017 - 07:55 PM
Is it possible, in C, to create an array of arrays of sructs?
I have a struct.  I also have several arrays of different lengths (stored in flash) containing instances of this struct.  Is it possible to create an array of these...
Wed. May 10, 2017 - 08:33 PM
Trouble interpreting compiler asm
I have the following code in my ATMega 6450 program:   x = read_fuse(); // Read fuse high byte to check OCDEN if (x & (1 << OCDEN) != 0) { ... The...
Tue. Mar 14, 2017 - 02:52 AM
How to read ATMega6450 fuse bits from program
I'd like to read the fuse bits (specifically OCDEN) in an ATMega6450 from the program running on it.  Possible?  If so, how?  Thanks.
Sat. Mar 11, 2017 - 08:28 PM
Best way to set or clear a single bit in a control register
I'd like to manually reset the TOV0 bit for timer0 in an ATMega6450.  The datasheet says to write a one to it.  It seems to me the way to do this without affecting other...
Wed. Mar 8, 2017 - 07:42 PM
Seeking solder/flux recommendation
My standard soldering "recipe" is Kester 245 flux cored solder with Kester 951 liquid flux.  Most of my work is SMD by hand (little through-hole, no reflow).  My goal is...
Tue. Dec 27, 2016 - 01:17 AM
Atmel-ICE + AS6.2 + ATMega6450: Unable to enter programming mode
I'm trying to bring up a new board of mine based on an ATMega6450.  I'm running AS6.2 on Win7 x64 with Atmel-ICE (current firmware).  A week ago I was able to write to...
Tue. Nov 29, 2016 - 05:08 AM
Does anybody know the difference between these two choices for the SUT_CKSEL fuse? This is for an ATMega6450, but I imagine the answer is the same for all Megas (or even all AVRs...
Sun. Nov 20, 2016 - 02:55 PM
SUT_CKSEL decoding for ATMega6450
So, I'm getting ready to program an ATMega6450 for the first time and notice all these options for the clock source (below).  I'm using an external 32kHz oscillator (the...
Sat. Nov 19, 2016 - 12:24 AM
Analog ground and AREF on ATMega6450 when not using ADC
I'm working on an ATMega6450 design that won't be using the ADC.  The data sheet says to connect AVCC to VCC in this case, but says nothing about AGND or AREF.  Should...
Mon. Oct 3, 2016 - 04:36 AM
Sharing JTAG pins with outputs
I'm working on an ATMega6450 design where I'll be using all the IO pins.  Programming and debug are via JTAG, but I also need these pins for output.  They'll be driving...
Mon. Sep 19, 2016 - 12:28 AM
How to filter out a power-on spike?
I have an ATTiny85 design that I power from a 24VDC wall wart.  My circuit has an LDO generating 5VDC from the 24VDC (there are no other active components on the 5V rail so...
Wed. Sep 7, 2016 - 01:09 AM