ST72325R6-AUTO STMicroelectronics, ST72325R6-AUTO Datasheet - Page 52

• Manufacturer Part Number: ST72325R6-AUTO
• Description: 8-bit Mcu For Automotive With 16 To 60 Kbyte Flash, Adc, Css, 5 Timers, Spi, Sci, I2c Interface
• Manufacturer: STMicroelectronics

Supply, reset and clock management
Figure 14. RESET sequences
6.6
6.6.1
52/250
WATCHDOG
RESET
RESET PIN
EXTERNAL
RESET
SOURCE
V
V
IT+(LVD)
IT-(LVD)
System integrity management (SI)
The System Integrity Management block contains the Low Voltage Detector (LVD) and
Auxiliary Voltage Detector (AVD) functions and Clock Security System (CSS). It is managed
by the SICSR register.
Low voltage detector (LVD)
The low voltage detector function (LVD) generates a static reset when the V
voltage is below a V
the power-down keeping the ST7 in reset.
The V
on in order to avoid a parasitic reset when the MCU starts running and sinks current on the
supply (hysteresis).
The LVD reset circuitry generates a reset when V
The LVD function is illustrated in
The voltage threshold can be configured by option byte to be low, medium or high.
V
RUN
DD
–
–
IT-
reference value for a voltage drop is lower than the V
V
V
Active Phase
IT+
IT-
RESET
when V
when V
LVD
IT-
DD
DD
reference value. This means that it secures the power-up as well as
is falling
is rising
t
t
h(RSTL)in
w(RSTL)out
RUN
Figure
Phase
Active
SHORT EXT.
RESET
15.
DELAY
t
h(RSTL)in
t
w(RSTL)out
RUN
DD
WATCHDOG UNDERFLOW
is below:
Phase
Active
LONG EXT.
RESET
INTERNAL RESET (256 or 4096 T
VECTOR FETCH
IT+
reference value for power-
RUN
ST72325xxx-Auto
Phase
Active
WATCHDOG
DD
RESET
t
w(RSTL)out
supply
CPU
RUN
)