Memories
■ Up to 4 Kbytes OTP
■ 128 bytes of RAM
■ Readout Protection

Core
■ Register File Based Architecture
■ 55 instructions
■ Hardware multiplication and division
■ Decision Processor for the implementation of Fuzzy Logic algorithms

Clock and Power Supply
■ Up to 20 MHz clock frequency.
■ Power Saving features

Interrupts
■ Up to 5 interrupt vectors
■ Top Level External Interrupt (INT)

I/O Ports
■ 19 I/O PINs configurable in Input and Output mode
■ High current sink/source in all pins. Peripherals
■ 3 Programmable 8-bit Timer/PWMs with internal 16-bit Prescaler featuring:
   – PWM output
   – Input capture
   – Output compare
   – Pulse generator mode
■ On-chip 8-bit Sample and Hold A/D Converter with 8-channel analog multiplexer (ST52T420/ E420 only)
■ Watchdog timer

Development tools
■ High level Software tools
■ Emulator
■ Low cost Programmer
■ Gang Programmer