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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