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Max speed of TWI
In the Meagre64 datasheet, the following note is found: Quote:Bit Rate Generator Unit This unit controls the period of SCL when operating in a Master mode. The SCL period is...
Tuesday, 19 February 2008 - 17:06
Changing TWI speed "on the fly"
I'm having to add a 100K I2C(TWI) part to an existing design in which all the other I2C parts run at 200K. Since the application spends a lot of time performing I2C transfers, I'm...
Wednesday, 9 January 2008 - 13:04
Local variables in RAM
I've spent the last few hours trying to track down a really strange problem. I'm using WinAVR 20070525. I've been using this version and earlier versions for a few years now,...
Thursday, 27 December 2007 - 13:03
Enabling internal pull-ups.
I just spotted (in another thread) the phrase "writing to PORTn WHILE THE PIN IS CONFIGURED AS AN INPUT to enable the internal pull-up" (my capitals). I've seen similar wording...
Tuesday, 18 December 2007 - 09:39
Does "pad" stand for anything?
Is "pad", as used for an attentuator(or possibly some sort of impedance matching network?) an acronym? Passive Attenuating Device? Power Attenuating device? Anyone know?
Saturday, 1 December 2007 - 11:48
Development board with 485 and bootloader?
I'm looking for an off-the-shelf development PCB that takes a Mega64 (or similar) and has RS485 capability. A USB-UART bridge would also be handy. Anyone know of anything that...
Thursday, 9 August 2007 - 13:23
Series/Parallel resonant crystal
This may be a stupid question, but I'm trying to use a tuner/PLL device which is specified for a 16MHz serial resonant crystal. The PCB guys didn't read the small print, and...
Friday, 3 August 2007 - 12:56
Problems with \xnn in C strings.
Even though I'm using GCC, I'm posting this here since I believe it is relevant to all C compilers. I have some strings which, in certain translations, contain special characters...
Thursday, 12 October 2006 - 15:02
Accessing assembler progmem from C
I have a bitmap in assembler source file form, and I want to copy it from flash to RAM by means of a C function. I have the line .global bitmap in the assembler, and I have...
Wednesday, 17 May 2006 - 16:10
Sharing RAM between different apps.
Suppose I have a Mega64, which is put into a sleep mode, and then either reset after a couple of seconds by the watchdog, or woken up by an external interrupt (I do, indeed have...
Tuesday, 25 April 2006 - 12:02
AVRDude with AVRISP problems.
I'm sure this question has come up before, but I don't seem to be able to find the answer. I used to be able to program a Mega16 using an AVRISP and AVRDude, it's not something I...
Thursday, 16 March 2006 - 14:28
Phase locked external RC osc.
I am considering trying to run an AVR in external RC mode, but with the R going to a (slightly variable - close to Vcc) voltage which can be controlled, possibly with a PWM output...
Friday, 6 January 2006 - 11:11