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internal pull-up for AVR GPIO pins when pins are INPUT?
Hi, I would like to confirm if there is already internal pull-up to Vcc when an AVR GPIO pin is set to input? If so, I don't need a 10Kohm input resistor, for example, when I...
Wednesday, 23 July 2014 - 05:50
Signal integrity with serial communication
Hi, I am looking to have a project where both ATMEGA ICs will be communicating with each other via USART, that is, their Rx & Tx pins. Due to the nature of the project, the...
Monday, 14 July 2014 - 20:05
Multiple grounds from multiple power sources in a circuit
Hi, Up until now I have been very happy and comfortable with one common GND from one power source for all my DIY projects. I am looking to do a clock project using a RTCC (Real-...
Friday, 28 February 2014 - 20:48
ATTINY84/ATTINY84A fuses problem with AVR Calculator site
Hi, Oh, boy...This is first time I attempt to use the ATTINY84A, which can go up to 20Mhz. Well, I have a 4Mhz crystal. I went to the AVR calculator site http://www.engbedded.com...
Sunday, 26 January 2014 - 02:43
How long of an array I can declare for PROGMEM?
I am using an ATMEGA644, 64KB flash. Obviously, I cannot declare and array that is larger than the flash size or large enough that would overwrite my firmware. Say my firmware is...
Thursday, 10 October 2013 - 05:18
STK600 JTAG ICE can be used to program others 32-bit uC?
Hi, I have an STK600 JTAG ICE. And I am able to program the ATUC32 uCs. My question is: Can any uC, e.g., STElectrionics' STM32F103C8, which is an ARM 32-bit with JTAG support...
Wednesday, 13 February 2013 - 05:15
Smoothing incoming and out going power supply
Hi, Please see the attached schematic. Notice of C1 then C3 for the 5V input. Then the 3.3V output has the reverse order of the ceramic capacitor first then the electrolytic. I...
Thursday, 7 February 2013 - 22:05
Simulating dual-ported SRAM with two pieces of SRAM
Hi, I am thinking of using two 32KB parallel SRAM chips as two banks, switching between writing and reading by two micro-controllers. One of the micro-controllers will be the...
Friday, 7 December 2012 - 18:35
Substituting a MOSFET with a NPN or PNP?
Hi, Please see the attached schematic (part of) that has T2, T3, and T4 using a MOSFET for amplifying the signal -- that is my guess, as I am not familiar with MOSFET at all. Ok...
Tuesday, 21 August 2012 - 19:59
Some basic multimeter questions -- not usage--but design
Ok, Say I would like to make a simple multimeter, maybe just voltmeter at first, with the ATMEGA8, which can take up to 5V. How would I make my voltmeter to measure even 24V...
Sunday, 17 June 2012 - 23:49
How to protect code being read with ATMEGAs and ATTINies?
Hi, To narrow down the question. How I would prevent firmware from being read from my ATMEGA8, TINY2313, ATTNY85, ATTINY84, etc.? I understand that by enabling the RSTDISBL fuse...
Sunday, 20 May 2012 - 18:49
BRNE 1 cycle or 2 cycles
Hi, I am using the ATMEGA8 at 16Mhz. The datasheet says that the instruction BRNE can take 1 or 2 cycles. Does BRNE below take one or two cycles? I believe it the offset to...
Sunday, 6 May 2012 - 06:28

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