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6 clocks per instruction 16-bit interpreter
I am circling back to an AVR project I was working on quite a while ago.  It is a microcomputer centered around an atmega644.  As we all know you cannot execute...
Wednesday, 10 August 2016 - 16:26
how to get word address of label in gcc avr gas?
I'm trying to get the address of a label loaded into the Z register so I can do an IJMP. My program is mostly in C, but I'm going to be doing a small part in assembly. This is...
Thursday, 17 July 2014 - 16:08
sd card spi mode checksum
I'm playing around with sd cards, and I've found that in SPI (one pin)mode, the enforcement of checksums is turned off. Is there any way to turn it back on? I'd like to know if...
Friday, 11 July 2014 - 23:49
safe level shifter for shared 3.3v/5v spi bus
I have a project with a 5v AVR that I wish to connect to a 3.3v spi device; in this case, an sdcard. I've seen many different takes on the level converter circuit; LVC IC's,...
Wednesday, 2 July 2014 - 16:47
maximum Timer1 OC0 frequency and VGA
I have a 'clone' of AtomicZombie's VGA generator. Running at 20mhz, there is a 10 mhz 'pixel clock'. This is because the instruction sequence to count on a port is inc, out, inc...
Friday, 25 April 2014 - 23:10
GPIO timing question
Hi, I'm new here. I've been playing around with an Atmega644 at 20Mhz, and I'm trying to figure out the GPIO timing. I tried to search for this, but maybe my terminology was a...
Friday, 14 June 2013 - 21:40