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Custom PCB using atmega32u4 appearing as unknown device
Old_Gold_Hand in Post#10 wrote: I plug in my device, Windows recognizes the ATMEGA32u4, I press the reset button, The DFU bootloader runs, I flash firmware over the USB, I...
Friday, 17 January 2020 - 02:05
ATMEGA328P serial communication displays special characters
Write to UBRR0H first, then UBRR0L   From the Atmega328P datasheet (20.5 USART Initialization): /*Set baud rate */ UBRR0H = (unsigned char)(ubrr>>8); UBRR0L = (unsigned...
Wednesday, 15 January 2020 - 22:40
ATmega 8U2/16U2/32U2 lowest possible power draw?
For AVR in general, see AVR Low Power Sleep Modes (Link), section "Tips and Tricks to Minimize Power Consumption".  
Wednesday, 15 January 2020 - 05:48
USART Interrupt Keeps Firing with No Data Input on RXCIF Flag Tuesday, 7 January 2020 - 22:48
Attiny412 can't communicate correctly with UART device (PMS7003)
If you don't have a logic analyzer or scope, you can measure the baud rate using a frequency counter by using a test program on the tiny412 to send a continuous stream of upper...
Saturday, 28 December 2019 - 22:24
What does "releases the SDA line" mean?
gone_bush wrote:So, with reference to the attiny85 with its DDR, PORTB and PINB, what does "releases" mean?   Use the DDR to switch the pin between input (high impedance, "...
Monday, 23 December 2019 - 07:52
ATmega328P CLKSEL Fuse Setting
Tim15 wrote:Why can any setting between 1111 and 1000 be used for establishing the Low power crystal oscillator?    The value depends on the...
Sunday, 22 December 2019 - 05:31
XMEGA32e5 TWI interface - Makes the head hurt - NO MORE START!
jgmdesign wrote:So, if anyone can help me figure out how to get the stop condition I would appreciate it.   In the Xmega E Manual, section 18.11.3 CTRLC:    ...
Friday, 20 December 2019 - 08:43
ATTINY88 driving 74LS logic
For the ATtiny88, there are 2 Gnd pins, a Vcc pin and a AVcc pin.   Are both Gnd pins connected to ground? Is the AVcc pin connected to Vcc?   The Vcc and AVcc pins...
Tuesday, 17 December 2019 - 07:34
Solved: No Clock on AT90USB162-16AU
What is the part number of the 16MHz crystal? I'm asking because your schematic shows that it has 4 leads, which is unusual.   What is the part number of the two 20pF...
Friday, 13 December 2019 - 21:16
Solved: No Clock on AT90USB162-16AU
clawson wrote:By default AVRs start life clocking from an internal RC oscillator.        From the AT90USB162 Datasheet: 6.3.1 Default Clock Source The...
Friday, 13 December 2019 - 10:53
Solved: No Clock on AT90USB162-16AU
Here is the schematic for the Olimex board for the AT90USB162: Note C1, C2, and C11.  These should be located close to the microcontroller pins.   Hear is the pinout...
Friday, 13 December 2019 - 02:08