Not Recommended for New Design. For new designs use AT25DF041A.4-Mbit Serial Firmware DataFlash®, SPI Mode 0 and 3 Compatible,
Byte Program with Sequential Byte Program Mode, Block Erase (4KB, 32KB...
The AT91X40 series features up to 256K bytes of on-chip SRAM, up to 128K bytes of on-chip ROM, up to 2M bytes of Flash, an
External Bus Interface, a 3-channel Timer/Counter, 2 USARTs, a Watchdog Timer...