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ST72104G1 Datasheet(PDF) 18 Page - STMicroelectronics

Part # ST72104G1
Description  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, I2C INTERFACES
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72104G1 Datasheet(HTML) 18 Page - STMicroelectronics

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6.1 LOW VOLTAGE DETECTOR (LVD)
To allow the integration of power management
features in the application, the Low Voltage Detec-
tor function (LVD) generates a static reset when
the VDD supply voltage is below a VIT- reference
value. This means that it secures the power-up as
well as the power-down keeping the ST7 in reset.
The VIT- reference value for a voltage drop is lower
than the VIT+ reference value for power-on in order
to avoid a parasitic reset when the MCU starts run-
ning and sinks current on the supply (hysteresis).
The LVD Reset circuitry generates a reset when
VDD is below:
–VIT+ when VDD is rising
–VIT- when VDD is falling
The LVD function is illustrated in the Figure 9.
Provided the minimum VDD value (guaranteed for
the oscillator frequency) is below VIT-, the MCU
can only be in two modes:
– under full software control
– in static safe reset
In these conditions, secure operation is always en-
sured for the application without the need for ex-
ternal reset hardware.
During a Low Voltage Detector Reset, the RESET
pin is held low, thus permitting the MCU to reset
other devices.
Notes:
1. The LVD allows the device to be used without
any external RESET circuitry.
2. Three different reference levels are selectable
through the option byte according to the applica-
tion requirement.
LVD application note
Application software can detect a reset caused by
the LVD by reading the LVDRF bit in the CRSR
register.
This bit is set by hardware when a LVD reset is
generated and cleared by software (writing zero).
Figure 9. Low Voltage Detector vs Reset
VDD
VIT+
RESET
VIT-
Vhyst


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