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INTRODUCTION

The ST72321R, ST72321AR and ST72321J devices are members of the ST7 microcontroller family designed for mid-range applications All devices are based on a common industry standard 8-bit core, featuring an enhanced instruction set and are available with FLASH or ROM program memory.

Under software control, all devices can be placed in WAIT, SLOW, ACTIVE-HALT or HALT mode, reducing power consumption when the application is in idle or stand-by state.

■ Memories

– 32K to 60K dual voltage High Density Flash (HDFlash) or ROM with read-out protection capability.

In-Application Programming and In-Circuit Programming for HDFlash devices

– 1K to 2K RAM

– HDFlash endurance: 100 cycles, data retention: 20 years at 55°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 os cillators, internal RC oscillator, clock security system 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 on 64-pin devices

– 15 external interrupt lines (on 4 vectors)

■ Up to 48 I/O Ports

– 48/32 multifunctional bidirectional I/O lines

– 34/22 alternate function lines

– 16/12 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

■ 3 Communications Interfaces

– SPI synchronous serial interface

– SCI asynchronous serial interface (LIN compatible)

– I2C multimaster interface

■ 1 Analog peripheral

– 10-bit ADC with up to 16 input pins

■ 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