ST92141 STMicroelectronics, ST92141 Datasheet - Page 7

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

1.1.4 Low Voltage Reset
The on-chip Low Voltage Detector (LVD) gener-
ates a static reset when the supply voltage is be-
low a reference value. The LVD works both during
power-on as well as when the power supply drops
(brown-out). The reference value for the voltage
drop is lower than the reference value for power-
on in order to avoid a parasitic reset when the
MCU starts running and sinks current on the sup-
ply (hysteresis).
1.1.5 I/O Ports
The I/O lines are grouped into two I/O Ports and
can be configured on a bit basis to provide timing,
status signals, an address/data bus for timer in-
puts and outputs, analog inputs, external wake-up
lines and serial or parallel I/O.
1.1.6 3-phase Induction Motor Controller
The IMC controller is designed for variable speed
motor control applications. Three pairs of PWM
outputs are available for controlling a three-phase
motor drive. Rotor speed feedback is provided by
capturing a tachogenerator input signal. Emergen-
cy stop is provided by putting the PWM outputs in
high impedance mode upon asynchronous faulty
event on NMI pin.
1.1.7 Watchdog Timer (WDT)
The Watchdog timer can be used to monitor sys-
tem integrity. When enabled, it generates a reset
after a timeout period unless the counter is re-
freshed by the application software. For additional
security, watchdog function can be enabled by
hardware using a specific pin.
1.1.8 Standard Timer
The standard timer includes a programmable 16-
bit down-counter and an associated 8-bit prescaler
with Single and Continuous counting modes.
1.1.9 Extended Function Timer
The Extended Function Timer can be used for a
wide range of standard timing tasks. It has a 16-bit
free running counter with programmable prescal-
er. Each timer can have up to 2 input capture and
2 output compare pins with associated registers.
This allows applications to measure pulse inter-
vals or generate pulse waveforms. Timer overflow
and other events are flagged in a status register
with optional interrupt generation.
1.1.10 Serial Peripheral Interface (SPI)
The SPI bus is used to communicate with external
devices via the SPI, or I²C bus communication
standards.
1.1.11 Analog/Digital Converter (ADC)
The ADC provides up to 6 analog inputs with on-
chip sample and hold. The analog watchdog gen-
erates an interrupt when the input voltage moves
out of a preset threshold.
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