INTRODUCTION

The ST72T331 HCMOS Microcontroller Unit (MCU) is a member of the ST7 family. The device is based on an industry-standard 8-bit core and features an enhanced instruction set.

■ User Program Memory (OTP/EPROM): 8 to 16K bytes

■ User EEPROM: 256 bytes

■ Data RAM: 384 to 512 bytes including 256 bytes of stack

■ Master Reset and Power-On Reset

■ Low Voltage Detector (LVD) Reset option

■ Run and Power Saving modes

■ 44 or 32 multifunctional bidirectional I/O lines:

– 15 or 9 programmable interrupt inputs

– 8 or 4 high sink outputs

– 8 or 6 analog alternate inputs

– 13 alternate functions

– EMI filtering

■ Software or Hardware Watchdog (WDG)

■ Two 16-bit Timers, each featuring:

– 2 Input Captures 1)

– 2 Output Compares 1)

– External Clock input (on Timer A)

– PWM and Pulse Generator modes

■ Synchronous Serial Peripheral Interface (SPI)

■ Asynchronous Serial Communications Interface (SCI)

■ 8-bit ADC with 8 channels 2)

■ 8-bit Data Manipulation

■ 63 basic Instructions and 17 main Addressing Modes

■ 8 x 8 Unsigned Multiply Instruction

■ True Bit Manipulation

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

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