Atmel

Processors

• AVR instruction set series starting at about $0.60 for the smallest 8-pin part (in ones); about $2.25 for the smallest 8-pin part that has ADC input (in ones) (as of 2004-06-17 DigiKey); goes up to about 16 MHz (a PIC running at 20 MHz can do about the same amount of work as a AVR running at 3 MHz)
• ARM Thumb instruction set AT91 series starting at about $16 (in ones) 100 pins and 33 MHz; goes up to 180 MHz. (as of 2004-06-17 DigiKey)
• At89S Series In System Programmable 8051 clones
• Atmel chips are used in the popular Arduino microcontrollers
• See also:
  • http://www.avr-forum.com/avrsource.html

Memory

• AT45D081 SPI serial interface 1MByte FLASH memory
  Andy at Montana Design Tech Support - http://www.montanadesign.com says:

  You can write to the Atmel's RAM buffer at any speed you desire. I use it to log data myself (but then, I generate a 256-byte page (no, I don't fill it completely for addressing reasons) in 16 mS, then flush to flash. If you do your algorithm smartly, you can be writing to one buffer while burning the other. I recommend the AT part because I've used it and I'm happy.

• Steven Root says

  I thought the extra clock pulse was required as well for a long time. I even wrote the code that way.

  Look closely. I think the extra pulse is only required if you use an inactive LOW clock pulse. As soon as you assume that the inactive state for the serial clock is HIGH then the extra clock pulse goes away!

  Everything works on the edges so starting from the low end gives you an extra pulse. I wish they would just recommend an active high clock in the spec sheet and be done with it.

  Since I changed to inactive HIGH clock I have rewritten the driver to remove the extra clock pulse. Now I can use generic 8 bit read and 8 bit write routines without inserting the extra pulse.

Distributed by:

• ARROW ELECTRONICS

See also:

• Pascel Compiler for AVR 4k version is free

See:

• /techref/drives.htm Disk Drives

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