The FM25F04 is a 4M-bit (512K-byte) Serial Flash
memory, with advanced write protection
mechanisms. The FM25F04 supports the standard
Serial Peripheral Interface (SPI).
The FM25F04 can be programmed 1 to 256 bytes at
a time, using the Page Program instruction. It is
designed to allow either single Sector/Block at a
time or full chip erase operation. The FM25F04
can be configured to protect part of the memory as
the software protected mode. The device can
sustain a minimum of 100K program/erase cycles on
each sector or block