描述 Description

The ST32F25A is a serial access microcontroller designed for secure mobile applications that incorporates the most recent generation of ARM processors for embedded systems. Its Cortex?-M3 32-bit RISC core operating at a 20-MHz frequency brings great performance and excellent code compacity to the application thanks to the Thumb?-2 instruction set.
The high-speed embedded Flash 256 Kbyte memory introduces more flexibility to the system.
The ST32F25A also offers a serial communication interface fully compatible with the ISO 7816-3 standard (T=0, T=1) for smartcard applications.
Two general purpose 16-bit timers are available.
A hardware Data Encryption Standard (DES) accelerator can be used to the user to optimize the application performance. A software library is provided for Advanced Encryption Standard (AES) implementation.
The ST32F25A operates in the –25 to +85°C temperature range and 1.8 V, 3 V and 5 V supply voltage ranges. A comprehensive range of power-saving modes enables the design of efficient low-power applications.
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK?packages, depending on their level of environmental compliance. ECOPACK?specifications, grade definitions and product status are available at: www.st.com. ECOPACK?is an ST trademark.

特性 Features

? Hardware features
? ARM? Cortex?-M3 32-bit RISC core
? 8 Kbytes of user RAM
? 256 Kbytes of user Flash memory with OTP area:
? 10-year data retention
? 100,000 Erase/Write cycles per page
? Page granularity of 128 Bytes
? Block granularity: 1 Kbyte
? 128 Bytes of OTP for user
? Page Erase time 3 ms
? Block Erase 1 Kbyte in 15 ms
? Programming performance up to 10μs/byte
? Flash Erase / Write Protection software programmable on 64 Kbyte sectors
? Asynchronous Receiver Transmitter supporting ISO 7816-3 T=0 and T=1 protocols
? Two 16-bit timers with interrupt capability
? 1.8V, 3V and 5V supply voltage ranges
? External clock frequency from 1 up to 7.5 MHz
? High performance provided by:
? CPU clock frequency up to 20 MHz
? External clock multiplier (2x, 3x, and 4x)
? Current consumption compatible with GSM and ETSI specifications
? Power-saving Standby state
? Contact assignment compatible ISO 7816-2
? ESD protection greater than 4 kV (HBM)
? Security features
? Monitoring of environmental parameters
? Protection against faults
? ISO 3309 CRC calculation block
? True random number generator
? Unique serial number on each die
? Hardware data encryption standard (DES) accelerator
? Software features
? Flash loader
? Flash drivers
? Development environment