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Attiny lock bits to prevent firmware from being read
Hi,   I am using the ATTINY2313, and I read in the datasheet that I can program the lock bits to prevent my firmware from being read, thus protecting my firmware.  ...
Sun. Oct 21, 2018 - 03:01 PM
Low voltage on old CPU, the MC68000 and MC68008 CPUs
Hi,   I am experimenting with the old CPUs.  Got some from eBay.  They are the MC68000 and the MC68008, both operating at 5V.   I basically wire them up on a...
Sat. May 12, 2018 - 04:42 AM
Why there is no TWI7 defined in samg5_xplained_pro.h for ASF for the SAMG55?
Hi,   I looked at the file samg55_xplained_pro.h and see the below #defines for all the TWI pins.  The SAMG55 has a TWI7 for peripheral B for pins PA27 and PA28.  ...
Wed. Aug 31, 2016 - 04:35 PM
How to turn on SAMG55J19's TWI7 peripheral B pin27A/pin28A
Hi all,   Appreciate pointing to the write direction how to set up the SAMG55J19 to use its TWI7 (I2C) from PIN27A/PIN28A.  According to the datasheet, I would have use...
Sun. Jul 24, 2016 - 05:10 AM
radial electrolytic caps replace polystyrene caps?
Hi,   I am looking to replace the Vectrex game console motherboard's polystyrene caps, which are quite expensive.  I am wondering if normal radial electrolytic caps like...
Sat. May 21, 2016 - 07:58 PM
Mysterious voltage drop?
Hi,   I am trying to interface with the TMS9918ANL (TI's Video Display Processor, 30 years old!).  Min voltage requires for this chip is 4.75V.   I use the ATMEGA...
Tue. Mar 29, 2016 - 05:29 PM
Can write fuses but CAN'T read back with usbtiny for ATMEGA328
Hi,   It's one of those fuse days again.  As you can see below, I can write the fuses for my ATMEGA328 (just the original ATMEGA328 not ATMEGA328P) using USBTiny...
Tue. Aug 25, 2015 - 12:32 AM
Replacing electrolytic caps for the power supply board of a 30-year-old computer
Hi,   Besides playing with AVR microcontrollers, I collect vintage computers.  I have acquired an Atari 1040STF, and I believe the caps on the power board need to be...
Sun. Jul 5, 2015 - 05:12 PM
Generating a clock frequency
Hi,   I follow the attached schematic to generate a 3.579545Mhz frequency, using the crystal 3.579545Mhz.  In the schematic, I choose C1 as 22pF.  The frequency...
Sat. Jan 17, 2015 - 10:54 PM
Analog GND and digital GND clarification needed
Hi,   Doing a project with SPI and MP3 player using the VS1003B MP3 decoder chip.  I've found a lot of projects on the net that I can try out.  One such project is...
Fri. Jan 2, 2015 - 07:51 PM
SPI MOSI -> MOSI?
Hi,   Pardon for this rather basic question.  But I just wanted to be sure.  When I use AVRDude to program an ATMEGA via SPI using the USBAsp program, MOSI pin of...
Fri. Jan 2, 2015 - 08:35 AM
Can tantalum capacitors be used instead of electrolytic ones?
Hi,   I am wondering if tantalum capacitors can be used instead electrolytic capacitors for the Vin and Vout of a power source?  My power source is basically the USB...
Mon. Dec 29, 2014 - 02:29 AM

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