ARMuC Wiki: AT91xyz

Explanation of the AT91 naming convention.

AT91XYZ X M = ROM/ROMless

         R = Lots of RAM
         F = Flash
         FR= Flash and lots of RAM
         RM= ROM and RAM
         SAM=Single chip Flash/SRAM products

Y 40 Basic Series

         63   With Dual Port RAM  (Use M42800 instead)
         43   63 with reduced pinout in BGA (Use M42800 instead)
         42   Improved Basic Series (Boundary scan, oscillator, SPI)
         55   Improved Basic series (Boundary scan, oscialltor, SPI, low power)
         920  Based on the ARM920T core         
         926  Based on the ARM926TE-J core
         946  Based on the ARM946E core

  M series
         M40400     (obsolete, replace by M40800)
         M40800
         M63200
         M43300
         M42800A
         M55800A

         AT91M40xyz   x = data in kB,y= EEPROM in kB, z = code (2 ^(z) kB)
         z = 1   =>   2kB
         z = 2   =>   4kB
         z = 3   =>   8kB
         z = 4   =>  16kB
         z = 5   =>  32kB
         z = 6   =>  64kB
         z = 7   => 128kB
         z = 8   => 256kB

         800  8 kB data,   0 kB EE,   0 kB code
         807  8 kB data,   0 kB EE, 128 kB code
         008  0 kB data,   0 kB EE, 256 kB code
         300  3 kB data,   0 kB EE,   0 kB code
         200  2 kB data,   0 kB EEm   0 kB code

   R series
         R40807
         R40008

   FR series
         F40816
         FR4081    (obsolete, replaced by FR40161)
         FR40161
         FR40162

   RM Series
         RM9200
         RM3400