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INTRODUCTION

The ST72371/ST72372 HCMOS Microcontroller Units are members of the ST7 family. These devices are based on an industry standard 8-bit core and feature an enhanced instruction set. The processor runs with an external clock up to 24 MHz with a 5.5V supply. Under software control the ST72371/ST72372 can be placed in WAIT, SLOW or HALT modes thus reducing power consumption. The enhanced instruction set and addressing modes afford real programming potential.

■ User Program Memory (ROM/OTP/EPROM): 16K bytes

■ Data RAM: 512 bytes, including 256 bytes of stack

■ Master Reset and Power-On Reset

■ Run, Wait, Slow, Halt and RAM Retention modes

■ 23 to 32 I/O lines:

– 4 to 5 programmable interrupt inputs

– 6 to 8 high sink outputs

– 4 to 8 analog alternate inputs

– 10 to 14 alternate functions

– EMI filtering

■ Programmable watchdog (WDG)

■ 16-bit Timer, featuring:

– 2 Input Captures

– 2 Output Compares (with 1 output pin)

– PWM and Pulse Generator modes

■ 8-bit Analog-to-Digital converter (4 to 8 channels)

■ Four 10-bit and one 12-bit Digital to Analog Converter Channels with PWM output

■ Fast I2C Multimaster Interface

■ Serial Communications Interface (SCI) (ST72371N only)

■ 8-bit Data Manipulation

■ 63 Basic Instructions

■ 17 main Addressing Modes

■ 8 x 8 Unsigned Multiply Instruction

■ True Bit Manipulation

■ Complete Development Support on PC/DOS WINDOWSTM Real-Time Emulator

■ Full Software Package on DOS/WINDOWSTM (C-Compiler, Cross-Assembler, Debugger)