GENERAL DESCRIPTION
INTRODUCTION
The ST72141K2-Auto devices are members of the ST7 microcontroller family designed specifically for motor control applications and including A/D conversion and SPI interface capabilities. They include an on-chip Motor Controller peripheral for control of electric brushless motors with or without sensors. An example application, for 6-step control of a Permanent Magnet DC motor, is shown in Figure 1.

■ Memories
    – 8 Kbytes Program memory (OTP/EPROM)
    – 256 bytes RAM
■ Clock, Reset and Supply Management
    – Enhanced reset system
    – Low voltage supply supervisor
    – 3 power saving modes
■ 14 I/O Ports
    – 14 multifunctional bidirectional I/O lines with: External interrupt capability (2 vectors), 13 alternate function lines, 3 high sink outputs
■ Motor Control peripheral
    – 6 PWM output channels
    – Emergency pin to force outputs to HiZ state
    – 3 analog inputs for rotor position detection with no need for additional sensors
    – Comparator for current limitation
■ 3 Timers
    – Two 16-bit timers with: 2 input captures, 2 output compares, external clock input, PWM and Pulse generator modes
    – Watchdog timer for system integrity
■ Communications Interface
    – SPI synchronous serial interface
■ Analog Peripheral
    – 8-bit ADC with 8 input pins
■ Instruction Set
    – 8-bit data manipulation
    – 63 basic instructions
    – 17 main addressing modes
    – 8 x 8 unsigned multiply instruction
    – True bit manipulation
■ Development Tools
    – Full hardware/software development package