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BREQ Instruction Bug
How big is the serial resistor on the LED? , sounds like it's not there ;)     Add: And I expect that you have a 100nF local capacitor between GND and Vcc ;) 
Thursday, 9 May 2019 - 21:37
BREQ Instruction Bug
How do you power cycle ?   Do yo have BOD enabled ?   For me it looks like a HW reset problem, so it can run at to low voltage.     Add: And how is reset...
Thursday, 9 May 2019 - 21:06
UART Rx missing byte issue
How (and where) do you handle the CRC ?   I'm not 100% sure about your needed timing, but for me it sounds like it would be better to deal with the 3 - 0.3ms timing in a...
Tuesday, 30 April 2019 - 22:10
Amtel studio 7 setting external crystal to 20Mhz on atmega324PB
a  Atmega324PB  can't run  @20MHz with a crystal, it's one of the chips where high power crystal osc. don't work.   Either run up to 16 MHz, or feed it...
Sunday, 28 April 2019 - 20:54
Any optimization tips for this...
My question was does a instruction like : CLA CLL IAC RAL   That basically mean load AC with 2, does it take 1 clk or 4 ?   It's just if you want to make it time...
Friday, 26 April 2019 - 22:52
Any optimization tips for this...
I have never looked at the pdp8 before so I had a look at wiki page.   How fast is a OPR instruction, alway as 1 instruction or 1 for each bit that is 1  or it...
Friday, 26 April 2019 - 16:39
Any optimization tips for this...
When I (for fun) was making a AVR emulator running on a AVR, (so code could be in EEPROM or RAM etc.). I did it by reading the two bytes for the instruction (High byte into ZL and...
Friday, 26 April 2019 - 13:10
Getting started ATtiny 1 & 0 series / Application Notes
I had a quick look at the code and have to ask : Don't microchip have any internal guidelines about C style ?  This make me sad to see next to each other: void...
Monday, 22 April 2019 - 09:55
from microprocessor to AVR to SRAM
Instead of dualport RAM, you could look into a true share of the RAM.   I assume that the "real" RAM is fast (like 55ns), so if you do a sync with the AVR and the Z80 they...
Thursday, 18 April 2019 - 12:13
from microprocessor to AVR to SRAM
Ok now I see understand the question, and my question is why? :)   For what you want to do it's normal to use dualport RAM.   There is a big problem with the AVR as a...
Thursday, 18 April 2019 - 10:55
from microprocessor to AVR to SRAM
yes very little info.   I assume that you have done something like this :   so first which latch do you use ? which speed of the AVR, RAM ?
Thursday, 18 April 2019 - 09:39
Different working speeds at the same baud rate
For sure 115200 baud is 115200 baud, but that is only the speed it send a byte with, nothing about delay between bytes, between packets.   Full speed 115200 baud in this case...
Thursday, 18 April 2019 - 09:26

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