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INTRODUCTION

The ST72321Mx Flash devices are members of the ST7 microcontroller family designed for midrange applications.

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

Features

■ Memories

– 32 Kbytes to 60 Kbytes dual voltage High Density Flash (HDFlash) with read-out protection capability. In-application programming and In-circuit programming.

– 1 Kbyte to 2 Kbytes RAM

– HDFlash endurance: 100 cycles at 85 °C; data retention: 40 years at 85 °C

■ Clock, reset and supply management

– Enhanced low voltage supervisor (LVD) for main supply and auxiliary voltage detector (AVD) with interrupt capability

– Clock sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock

– PLL for 2x frequency multiplication

– Four power saving modes: Halt, Active-Halt, Wait and Slow

■ Interrupt management

– Nested interrupt controller

– 14 interrupt vectors plus TRAP and RESET

– Top Level Interrupt (TLI) pin

– 15 external interrupt lines (on 4 vectors)

■ Up to 64 I/O ports

– 64 multifunctional bidirectional I/O lines

– 34 alternate function lines

– 16 high sink outputs

■ 5 timers

– Main clock controller with: Real-time base, Beep and Clock-out capabilities

– Configurable watchdog timer

– Two 16-bit timers with: 2 input captures, 2 output compares, external clock input on one timer, PWM and pulse generator modes

– 8-bit PWM Auto-Reload timer with: 2 input captures, 4 PWM outputs, output compare and time base interrupt, external clock with event detector

■ 4 Communication interfaces

– SPI synchronous serial interface

– SCI asynchronous serial interface

– I2C multimaster interface (SMbus V1.1 compliant)

■ Analog periperal (low current coupling)

– 10-bit ADC with 16 input robust input ports

■ Instruction set

– 8-bit data manipulation

– 63 basic Instructions

– 17 main addressing modes

– 8 x 8 unsigned multiply instruction

■ Development tools

– Full hardware/software development package

– In-circuit testing capability