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INTRODUCTION

The ST72C171 is a member of the ST7 family of Microcontrollers. All devices are based on a common industry-standard 8-bit core, featuring an enhanced instruction set.

The ST72C171 features single-voltage FLASH memory with byte-by-byte In-Situ Programming (ISP) capability.

■ Memories

– 8K of single voltage Flash Program memory with read-out protection

– In-Situ Programming (Remote ISP)

■ Clock, Reset and Supply Management

– Enhanced Reset System

– Low voltage supervisor (LVD) with 3 programmable levels

– Low consumption resonator or RC oscillators (internal or external) and by-pass for external clock source, with safe control capabilities

– 3 Power Saving modes

■ 22 I/O Ports

– 22 multifunctional bidirectional I/O lines:

– 16 interrupt inputs on 2 independent lines

– 8 lines configurable as analog inputs

– 20 alternate functions

– EMI filtering

■ 2 Timers and Watchdog

– One 16-bit Timer with: 2 Input Captures, 2 Output Compares, external Clock input, PWM and Pulse Generator modes

– One 8-bit Autoreload Timer (ART) with: 2 PWM output channels (internally connectable to the SPGA inputs), 1 Input Capture, external clock input

– Configurable watchdog (WDG)

■ 2 Communications Interfaces

– Synchronous Serial Peripheral Interface (SPI)

– Serial Communications Interface (SCI)

■ 3 Analog peripherals

– 2 Software Programmable Gain Operational Amplifiers (SPGAs) with rail-to-rail input and output, VDD independent (band gap) and programmable reference voltage (1/8 VDD resolution), Offset compensation, DAC & on/off switching capability

– 1 rail-to-rail input and output Op-Amp

– 8-bit A/D Converter with up to 11 channels (including 3 internal channels connected to the Op-Amp & SPGA outputs)

■ Instruction Set

– 8-bit data manipulation

– 63 basic Instructions

– 17 main addressing modes

– 8 x 8 unsigned multiply instruction

– True bit manipulation

■ Development Tools

– Full hardware/software development package