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INTRODUCTION

The ST72324 devices are members of the ST7 microcontroller family designed for the 5V operating range.

– The 32-pin devices are designed for mid-range applications

– The 42/44-pin devices target the same range of applications requiring more than 24 I/O ports.

■ Memories

– 8 to 32K dual voltage High Density Flash (HDFlash) with read-out protection capability. InApplication Programming and In-Circuit Programming for HDFlash devices

– 384 to 1K bytes 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 with programmable reset thresholds and auxiliary voltage detector (AVD) with interrupt capability

– Clock sources: crystal/ceramic resonator oscillators, 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

– 10 interrupt vectors plus TRAP and RESET

– 9/6 external interrupt lines (on 4 vectors)

■ Up to 32 I/O Ports

– 32/24 multifunctional bidirectional I/O lines

– 22/17 alternate function lines

– 12/10 high sink outputs

■ 4 Timers

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

– Configurable watchdog timer

– 16-bit Timer A with: 1 input capture, 1 output compare, external clock input, PWM and pulse generator modes

– 16-bit Timer B with: 2 input captures, 2 output compares, PWM and pulse generator modes

■ 2 Communication Interfaces

– SPI synchronous serial interface

– SCI asynchronous serial interface

■ 1 Analog Peripheral (low current coupling)

– 10-bit ADC with up to 12 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