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ST22N144

Smartcard 32-Bit RISC MCU with 144 Kbytes EEPROM Javacard™ HW Execution & Cryptographic Library

STMicroelectronics 

ST22N144

DESCRIPTION

The ST22N144 is a member of the SmartJ™ plat-

form using a 32-bit Reduced Instruction Set Com-

puter (RISC) core to execute both Native RISC

instructions and JavaCard™ 2.x Technology in-

struction (byte codes) directly (See Figure 2.

"SmartJ™ Platform EEPROM Architecture", on

page 3).

Direct JavaCard™ byte code execution provides

high performance advantage over processors that

emulate the JavaCard™ byte code instruction set.

The product features a 24-bit wide linear address-

ing capability and includes User ROM, User RAM,

and User EEPROM.

Memory and Peripheral accesses are controlled

by a Memory Protection Unit that allows to imple-

ment firewalls between applications.

Memories are accessed via two different buses,

allowing simultaneous accesses to code and data.

Memory load and stores can be performed at byte,

short (2-bytes), or word (4-bytes) granularity, with

optional pointer auto increment.

The ST22 core includes dedicated instructions to

accelerate performances of the following algoriths:

– DES and Triple DES

– Modular Arithmetic on big numbers,

– Characteristic two field arithmetic to support

efficiently Elliptic Curves,

– CRC 16-bit ISO 3309.

The product has clock and power management,

2 User configurable Timers, a Central Interrupt

Controller and a Random Number Generator.

Figure 2. SmartJ™ Platform EEPROM Architecture

POWER MANAGEMENT

32-bit

RISC

CORE

MPU

RAM

PERIPHERALS

BUS 1

BUS 2

ISO

7816

CLOCK MANAGEMENT

ROM

EEPROM

3/7

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