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INTRODUCTION

The ST72T311 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. The device is normally operated at a 16 MHz oscillator frequency. Under software control, the ST72T311 may be placed in either Wait, Slow or Halt modes, thus reducing power consumption. The enhanced instruction set and addressing modes afford real programming potential.

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

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

■ Master Reset and Power-On Reset

■ Low Voltage Detector 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)