ST92T163 ST Microelectronics, ST92T163 Datasheet - Page 88

• Manufacturer Part Number: ST92T163
• Description: 8/16-BIT FULL SPEED USB MCU FOR COMPOSITE DEVICES WITH 16 ENDPOINTS
• Manufacturer: ST Microelectronics

ST92163 - RESET AND CLOCK CONTROL UNIT (RCCU)
5.8 LOW VOLTAGE DETECTOR (LVD) 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).
Figure 47. Low Voltage Detector Reset Function
Figure 48. Low Voltage Detector Reset Signal
Note: Refer to Electrical Characteristics for the values of V
88/224
V
Internal Reset
DD
RESET
(External pin)
V
DD
Low Voltage
Detector Reset
V
LVDUP
The LVD circuitry generates a reset when V
below:
– V
– V
The Low Voltage Detector circuitry resets only the
MCU and it does not change the external RESET
pin status: no reset signal for an external applica-
tion is generated.
LVDUP
LVDOWN
DD
, V
LVDUP
when V
when V
and V
DD
V
DD
LVDDOWN
is rising
LVDDOWN
is falling
Internal Reset
.
DD
is