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Polarity Inversion of RXD for Atmega UART?
Is there a way to invert the RXD input or is an external hardware inverter required if the serial input is quiescent low with start bit being a transition to a high?
Thursday, 1 November 2012 - 10:53
ATtiny24/44/84 SPI Master (using USI) at fclk/2
I think I've read in other posts on this forum that the maximum reliable SPI speed for AVR USI was fclk/4. But, the ATtiny24/44/84 spec has an ASM example running as a master at...
Sunday, 25 December 2011 - 17:00
Big Code Size Impact due to increment of Global?
I was suprised to see what seemed like a small change caused a very large code impact. Here's the code fragment that causes the size impact: delay_time++; _delay_us(delay_time...
Wednesday, 30 November 2011 - 15:57
Building Atmega168 code for Atmega328p
I picked up code and Makefile from http://www.sparkfun.com/commerce... I noticed the chip on the serial interface board was an atmega328p, not a atmega168. So, I changed the...
Wednesday, 22 September 2010 - 19:27
Can't find distributor with stock of ATTinyX4-20SSU
So, now I have a project ready to start building quantities of 100 processors or so. But, now no one has stock for the processor I need (not even in quatities of 1) :cry: (...
Friday, 17 September 2010 - 13:35
Output Pins in Sleep State
I'm chasing an issue that occurs only on a few devices. The issue is excessive battery drain. I'm wondering if the device the ATTiny24 is communicationg with is not actively kept...
Friday, 10 September 2010 - 11:56
Running out of SRAM--How to tell if that's happening?
I have some fairly complex software and I'm worried about running out of SRAM in a Tiny 44/84 I'm worried that when SRAM exhaustion does finally occur, I'll end up "blowing the...
Wednesday, 24 February 2010 - 11:12
Watching local variables in simulator
It seems like local variables are always "not in scope" when I try to watch them (even though the current execution point is on a line that references them). Is this a result of...
Wednesday, 3 February 2010 - 19:40
Un-programmed Tiny84--what will it do on first power-up
Just receive and reflowed my PCB with (among other things) a Tiny84 on it. I'm ready for first power-up, and (if lucky) program the Tiny84. But, I was wondering what the...
Friday, 22 January 2010 - 01:27
No Address Ack from Slave, USITwi, AVR310
I'm working on a new project where I want to have a master talking to multiple slaves via I2C. While I'm waiting for my pcb, I'm using two BlinkMs to try to get the I2C part of...
Tuesday, 19 January 2010 - 14:30
Shared bus ISP, SCK pull-up or pull-down resistor needed?
Hi I'm designing a PCB that will have five AVRs on it. I want them to share the ISP bus. I will have jumpers on SCK and MISO so when in programing mode, only one AVR will have...
Tuesday, 22 December 2009 - 15:24