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confused about interrupts on AVR-0 series
I don't understand how lower priority interrupts are kept from pre-empting a higher level ISR before the first instruction in the ISR executes. Here is the scenario: 1) high...
Sunday, 4 July 2021 - 22:25
OctOS: a simple tasking system for AVRs
I posted about this previously in this thread.  After that, I did go on to verify the code in SPIN and found errors.  I revamped the code to be more amenable to use in C...
Saturday, 3 April 2021 - 14:16
16-bit copies and the TEMP registers on AVR 0-series
Here is what is said in the megaAVR 0-series on 16 bit copies:   The wording seems to indicate that if I read the high byte, I get a read from the TEMP register. But I'm...
Saturday, 26 December 2020 - 00:50
boost converter project using AVR-0 series
Hi All, I posted in the "show off your 2020 project" thread about my boost converter project using ATmega4809.  The post was getting some responses so I thought I'd start a...
Thursday, 26 November 2020 - 15:37
what CPU version is the ATmega4809 ?
Hi All,   In the Microchip AVR Instruction Manual, DS40002198A dated 2020, there is a table of AVR CPU versions.  Do you know how I can find out which of these...
Wednesday, 25 November 2020 - 17:18
OctOS: a minimalist preemptive multi-tasking "OS" for AVR
Last fall I wrote a multitasking system for AVR micros.  My goal is to shoehorn solid capability into a small space.   I have no specific questions, just looking for...
Friday, 28 August 2020 - 15:24
mega4809 crystal calibration problem: status report
  Hi All,   ka7ehk started a thread here looking to calibrate the mega4809 crytal using the RTC.CALIB register.  You have a 32768 Hz crystal connected (to the RTC...
Saturday, 22 August 2020 - 01:47
mega4809 RTC PIT scaling for events not what I expected
As stated in another thread, I have been working with the Microchip 4908 Curiosity Nano to pipe the RTC PIT, clocked by the external crystal, to TCB0 using the event system....
Sunday, 16 August 2020 - 18:48
nano curiosity 4809: TCB0 FRQ mode not getting capture value
    Hi All,   I've made progress on working with clocks on the mega4809 on the Microchip Nano Curiososity board.   I have the 32768 Hz external crystal driving...
Friday, 14 August 2020 - 20:17
nano curiosity 4809: can't enable ext 32.768 kHz oscillator
Hi All,   I have a Nano Curiosity 4809.  I was trying to get the RTC working with the external crystal but I'm failing. I trimmed down code to enable the oscillator and...
Tuesday, 11 August 2020 - 15:12
Q on mega 0-series TWI slave protocol
  Hi All,   I'm working on a state transition diagram for slave mode I2C software.  I've started with the read part.  See diagrams below. Here is the question...
Tuesday, 16 June 2020 - 19:33
cheap, small logic analyzer
  DId a search for logic analyzers.  Last thread was 2013.   I'm thinking of this USB one from inno, listed on Amazon as the Inno Maker LA1010 USB for $79.  ...
Wednesday, 5 February 2020 - 02:00

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