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Discussion Title Created date
Xmega clock question.
Freaks, I am reviewing the Preliminary data sheet for the Xmega. Section 7.4.2.1 seems to state that the Xmega can only run from an external xtal up 16Mhz. Am I missing something...
Wednesday, 15 April 2009 - 14:12
How do I trig an int from firmware and hardware?
Freaks, I have an ISR that is triggered by an external sensor. It is tied to int0. I also need to trigger the same int from firmware. The input is externally pulled high by a 1.1K...
Tuesday, 14 April 2009 - 19:12
PD1 difficulty on the ATmega640
Freaks, I am trying to use int1 (PD1. pin44) on the ATmega640. For some reason the pin sits at 0.6Vdc. It is connected to a p/u (2.2K) tied to 5Vdc. It is configured as an i/p. I...
Friday, 3 April 2009 - 19:48
EEprom wear question.
Freaks, Can anyone comment on whether or not you "wear" the eeprom if you write the same byte to the same location.( In AVR GCC ). ie. If I write 0xAA to location 0x100 repeatedly...
Friday, 27 March 2009 - 19:33
Is there a primer available on using the eeprom in the 640.
Freaks, I am looking for some help setting up and using the EEPROM on the 640 and 1280. I have searched the documentation and this site. Most of what I can find is complaints...
Monday, 9 March 2009 - 21:00
Encoder for operator input
I am looking for an encoder to use as an operator i/p device. It should also have a switch that is activated when the shaft is pressed in. I will need to buy these on an ongoing...
Monday, 23 February 2009 - 18:19
PGM_P pointer passing
Freaks, How do I pass a PGM_P contained in a two dimensional array of PGM_P pointers to a function? A
Thursday, 5 February 2009 - 20:46
How do I declare a global var so it resides on the stack?
Freaks, I am using an ATmega1280 with external ram. I need to declare a global variable so that it resides on the stack. How is this done? A
Thursday, 29 January 2009 - 15:22
Can this be aligned?
Freaks, Is it possible to align the pointer in this union with the last byte in the long? union{ unsigned long l; char *ptr; }q; Thanks, A EDIT: Never mind. I...
Wednesday, 28 January 2009 - 15:35
Can you simulate paged RAM?
Guys, Is there any way to simulate paged RAM using AVRstudio4? A
Tuesday, 27 January 2009 - 20:43
How do I page ram?
Freaks, I have an app that uses an ATmega1280. I have put a 32K battery backed SRAM and 512K RAM (buffer) in the upper 32K of the external memory map. Our app works fine with the...
Wednesday, 21 January 2009 - 19:25
AVR over clocking
Hi, Does anyone have any experience with over clocking the ATmega1280? I know this part is rated at 16Mhz but what do you think I could get away with. ( reliably ). :roll: A
Monday, 19 January 2009 - 20:04

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