INTRODUCTION
The ST92141 microcontroller is developed and manufactured by STMicroelectronics using a proprietary n-well HCMOS process. Its performance derives from the use of a flexible 256-register programming model for ultra-fast context switching and real-time event response. The intelligent onchip peripherals offload the ST9 core from I/O and data management processing tasks allowing critical application tasks to get the maximum use of core resources. The new-generation ST9 MCU devices now also support low power consumption and low voltage operation for power-efficient and low-cost embedded systems.

■ Register File based 8/16 bit Core Architecture with RUN, WFI, SLOW, HALT and STOP modes
■ 0-25 MHz Operation (internal clock) @ 5V±10% voltage range
■ -40°C to +85°C Operating Temperature Range
■ Fully Programmable PLL Clock Generator, with Frequency Multiplication and low frequency, low cost external crystal (3-5 MHz)
■ Minimum Instruction Cycle time: 160 ns - (@ 25 MHz internal clock frequency)
■ Internal Memory:
    – EPROM/OTP/FASTROM 16K bytes
    – RAM 512 bytes
■ 224 general purpose registers available as RAM, accumulators or index pointers (register file)
■ 32-pin Dual Inline and 34-pin Small Outline Packages
■ 15 programmable I/O pins with Schmitt Trigger input, including 4 high sink outputs (20mA @ VOL=3V)
■ 4 Wake-up Interrupts (one usable as NonMaskable Interrupt) for emergency event management
■ 3-phase Induction Motor Controller (IMC) Peripheral with 3 pairs of PWM outputs and asynchronous emergency stop
■ Serial Peripheral Interface (SPI) with Master/ Slave Mode capability
■ 16-bit Timer with 8-bit Prescaler usable as a Watchdog Timer
■ 16-bit Standard Timer with 8-bit Prescaler
■ 16-bit Extended Function Timer with Prescaler, 2 Input Captures and 2 Output Compares
■ 8-bit Analog to Digital Converter allowing up to 6 input channels with autoscan and watchdog capability
■ Low Voltage Detector Reset
■ Rich Instruction Set with 14 Addressing Modes
■ Division-by-Zero trap generation
■ Versatile Development Tools, including Assembler, Linker, C-compiler, Archiver, Source Level Debugger and Hardware Emulators with Real-Time Operating System available from Third Parties