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Producing an opposite signal from output compare...
I want to drive a piezo and there are two ways.  Maximum volume comes alternating both signals at the same time like this:       DDRD|=_BV(6) | _BV(7);...
Sunday, 18 August 2019 - 03:28
Would you guys use the shutdown feature of this?
I'm making a floppy drive emulator for the Epson PX-8 CP/M computer.  It is basically an atmega1284 + hcms 8 char LED display + microsd socket + rs232 transceiver + a couple...
Saturday, 17 August 2019 - 18:13
Best 3 pin order for custom UPDI connector...
For many years I've used what I call "inline ISP" which is basically just the 2x3 ISP connector put into a 1x6, still 100 mil.  It allows programming from either side of the...
Thursday, 15 August 2019 - 02:40
ISR Multiplexing strategy with brightness/gamma adjustment
My plan to support multiple brightness levels has been to run the ISR a multiple number of times faster.  For example, if I want 100 Hz refresh and have 8 rows, that would be...
Wednesday, 14 August 2019 - 22:56
324PB max gnd and vcc current...
The datasheet says 100mA max, but the 324P says 200mA max - 100mA seems pretty low.
Tuesday, 13 August 2019 - 02:32
microsd - how long do you wait before trying to access
I want to give the user enough time to make sure the card is seated - the socket I'm using seems especially touchy with the CD signal.  It switches it to ground or open and...
Monday, 29 July 2019 - 21:53
Using MSPIM for buffering
On a mega1284 last night I was using the regular SPI at clk/2 and because of no buffering there are gaps between bytes being transferred.  I suppose this is the nature of SPI...
Thursday, 25 July 2019 - 12:26
How would you configure the ADC for 2 cell low battery
Consider that the 2 cells could be alkaline or NiMH and that they will be fed to a boost regulator that pushes them up to 3.3V.  A fully fresh alkaline pair could also be 3....
Tuesday, 23 July 2019 - 02:48
Any optimization tips for this...
Hi Everyone,   So I moved my initial pdp8 emulation code over to the XMEGA 128A1U running at 29.4912 MHz, and it began at around 108K instructions per second running my...
Thursday, 25 April 2019 - 21:24
ATXMEGA128A1U EBI questions...
Having spent some time reading and rereading the datasheet, I've got a few questions for anyone in the know here!   I only need to access 64K of SRAM and don't want to use...
Tuesday, 16 April 2019 - 23:12
MEGA640 vs. XMEGA128A1U for this project
I have been contemplating making a handheld board that simulates/emulates a PDP-8, but with an octal control panel so you can key in instructions and step through them and watch...
Tuesday, 16 April 2019 - 17:17
324PB compatible with 324P ?
I saw some notes about this in the 328PB manual for it being code compatible with 328P, but I wonder if the same holds true for the 324PB.  I didn't see it in the datasheet...
Sunday, 14 April 2019 - 14:19

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