The ST21F256 product is a serial access microcontroller specially designed for costeffective secure mobile applications. Features Hardware features Enhanced 8/16-bit CPU core with 16 Mbytes of linear addressable memory 7 Kbytes of User RAM 256 Kbytes of User Flash memory with OTP area: 10-year data retention 100,000 Erase/Write cycles Page granularity of 128 Bytes Block granularity: 1 Kbyte 128 ...