ST72361AR7 STMicroelectronics, ST72361AR7 Datasheet - Page 25
ST72361AR7
Manufacturer Part Number
ST72361AR7
Description
8-BIT MCU WITH FLASH OR ROM, 10-BIT ADC, 5 TIMERS, SPI, 2x LINSCI™
Manufacturer
STMicroelectronics
Datasheet
1.ST72361AR7.pdf
(225 pages)
Specifications of ST72361AR7
Hdflash Endurance
100 cycles, data retention 40 years at 85°C
5 Power Saving Modes
Halt, Auto Wake Up From Halt, Active Halt, Wait and Slow
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SYSTEM INTEGRITY MANAGEMENT (Cont’d)
6.4.2 Auxiliary Voltage Detector (AVD)
The Voltage Detector function (AVD) is based on
an analog comparison between a V
V
ply. The V
age is lower than the V
rising voltage in order to avoid parasitic detection
(hysteresis).
The output of the AVD comparator is directly read-
able by the application software through a real
time status bit (AVDF) in the SICSR register. This
bit is read only.
Caution: The AVD function is active only if the
LVD is enabled through the option byte.
6.4.2.1 Monitoring the V
If the AVD interrupt is enabled, an interrupt is gen-
erated when the voltage crosses the V
V
In the case of a drop in voltage, the AVD interrupt
acts as an early warning, allowing software to shut
Figure 16. Using the AVD to Monitor V
IT+(AVD)
IT-(AVD)
AVDF bit
AVD INTERRUPT
REQUEST
IF AVDIE bit = 1
LVD RESET
V
V
V
V
IT+(AVD)
IT+(LVD)
IT-(LVD)
IT-(AVD)
threshold (AVDF bit toggles).
reference value and the V
IT-(AVD)
V
DD
reference value for falling volt-
0
IT+(AVD)
DD
Main Supply
reference value for
1
DD
INTERRUPT PROCESS
IT-(AVD)
IT+(AVD)
main sup-
V
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
DD
hyst
RESET VALUE
and
or
down safely before the LVD resets the microcon-
troller. See
The interrupt on the rising edge is used to inform
the application that the V
If the voltage rise time t
CPU cycles (depending on the reset delay select-
ed by option byte), no AVD interrupt will be gener-
ated when V
If t
– If the AVD interrupt is enabled before the
– If the AVD interrupt is enabled after the V
V
terrupts will be received: The first when the
AVDIE bit is set and the second when the thresh-
old is reached.
threshold is reached, then only one AVD inter-
rupt occurs.
rv
IT+(AVD)
is greater than 256 or 4096 cycles then:
threshold is reached, then two AVD in-
Figure
IT+(AVD)
t
1
16.
rv
VOLTAGE RISE TIME
is reached.
rv
DD
is less than 256 or 4096
warning state is over.
INTERRUPT PROCESS
0
ST72361
IT+(AVD)
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