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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
Can anyone confirm correct default fuses for ATTINY2313?
ATDF file says 0x62 for the low fuse, but the datasheet says 0x64.  Any idea which is correct?  Datasheet error?
Friday, 5 April 2019 - 23:25
ATtiny80-XNR / ATtiny840-XBT / ATtiny840-XNR
I was looking to update devices that the autoprogrammer supports and came up with this list by comparing the ATDF files vs the XML ones I did years ago:   {"ATmega324PB",0x1e...
Thursday, 4 April 2019 - 14:58
Is there a XML or database of atmel devices by programming type ISP, PDI, etc.
I used to make a list of them by examine XML files like ATmega328.xml, but it has been a long time.  If I wanted a list of all ISP devices, or all PDI devices, any ideas on...
Wednesday, 3 April 2019 - 20:30
What is the best way to read/write XMEGA EEPROM these days...
I know there was AVR1315, but it is probably way outdated by now.  Need to read a block of memory from EEPROM (which can likely be done one byte at a time), and also want to...
Tuesday, 2 April 2019 - 16:01
PROGMEM structures on 128K device
So if I have a: const uint8_t PROGMEM MsgCRCM[]={'c','R','c','M', 0,0,0, 0,0,}; On a 128K ATMEGA1284P, should this be a 16 bit pointer?   I know the flash is 64K 16bit...
Saturday, 30 March 2019 - 01:50
Optimizing 256 byte ring buffer
I was just going to go with a 255 byte ring buffer so I could keep the size field in a simple uint8_t, but I though t there has to be a way to eliminate those if it is 255 then...
Wednesday, 27 March 2019 - 12:23
Clearing TXCn before writing UDR
I remember some sort of note about clearing this flag before writing UDR, but don't see it in any of the datasheets I am looking at (atmega640/328/etc.).  Does anyone...
Sunday, 24 March 2019 - 02:10
Why the two ranges for OSCCAL?
Just curious if anyone knows.
Saturday, 23 March 2019 - 18:29

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