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INTRODUCTION

The ST72334J/N-Auto, ST72314J/N-Auto and ST72124J-Auto devices are members of the ST7 microcontroller family. They can be grouped as follows:

– ST72334J/N-Auto devices are designed for mid range applications with Data EEPROM, ADC, SPI and SCI interface capabilities.

– ST72314J/N-Auto devices target the same range of applications but without Data EEPROM.

– ST72124J-Auto devices are for applications that do not need Data EEPROM and the ADC peripheral.

All devices are based on a common industry standard 8-bit core, featuring an enhanced instruction set.

The ST72C334J/N-Auto, ST72C314J/N-Auto and ST72C124J-Auto versions feature single-voltage Flash memory with byte-by-byte In-Situ Programming (ISP) capability.

■ Memories

– 8 or 16 Kbyte Program memory (ROM or single voltage Flash) with readout protection and in-situ programming (remote ISP)

– 256 bytes EEPROM Data memory (with read out protection option in ROM devices)

– 384 or 512 bytes RAM

■ Clock, Reset and Supply Management

– Enhanced reset system

– Enhanced low voltage supply supervisor with 3 programmable levels

– Clock sources: crystal/ceramic resonator oscillators or RC oscillators, external clock, backup Clock Security System

– 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

– Beep and clock-out capabilities

■ Interrupt Management

– 10 interrupt vectors plus TRAP and RESET

– 15 external interrupt lines (4 vectors)

■ 44 or 32 I/O Ports

– 44 or 32 multifunctional bidirectional I/O lines:

– 21 or 19 alternate function lines

– 12 or 8 high sink outputs

■ 4 Timers

– Configurable watchdog timer

– Real-time base

– Two 16-bit timers with: 2 input captures (only one on timer A), 2 output compares (only one on timer A), External clock input on timer A, PWM and Pulse generator modes

■ 2 Communications Interfaces

– SPI synchronous serial interface

– SCI asynchronous serial interface (LIN compatible)

■ 1 Analog Peripheral

– 8-bit ADC with 8 input channels (6 only on ST72334Jx, not available on ST72124J2)

■ 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