ST72325R6-AUTO STMicroelectronics, ST72325R6-AUTO Datasheet - Page 54

• 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 16. Using the AVD to monitor V
54/250
AVDF bit
AVD INTERRUPT
REQUEST
IF AVDIE bit = 1
LVD RESET
V
V
V
V
IT+(AVD)
IT+(LVD)
IT-(AVD)
IT-(LVD)
In the case of a drop in voltage, the AVD interrupt acts as an early warning, allowing
software to shut down safely before the LVD resets the microcontroller. See
The interrupt on the rising edge is used to inform the application that the V
is over.
If the voltage rise time t
selected by option byte), no AVD interrupt will be generated when V
If t
●
●
Monitoring a voltage on the EVD pin
This mode is selected by setting the AVDS bit in the SICSR register.
The AVD circuitry can generate an interrupt when the AVDIE bit of the SICSR register is set.
This interrupt is generated on the rising and falling edges of the comparator output. This
means it is generated when either one of these two events occur:
●
●
The EVD function is illustrated in
For more details, refer to
V
DD
rv
is greater than 256 or 4096 cycles
two AVD interrupts will be received if the AVD interrupt is enabled before the V
threshold is reached: the first when the AVDIE bit is set, and the second when the
threshold is reached.
only one AVD interrupt will occur if the AVD interrupt is enabled after the V
threshold is reached.
V
V
EVD
EVD
0
rises up to V
falls down to V
1
rv
IT+(EVD)
INTERRUPT PROCESS
is less than 256 or 4096 CPU cycles (depending on the reset delay
IT-(EVD)
Chapter 19: Electrical
V
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
hyst
DD
(AVDS bit = 0)
RESET VALUE
Figure
17.
characteristics.
t
1
rv VOLTAGE RISE TIME
IT+(AVD)
ST72325xxx-Auto
INTERRUPT PROCESS
DD
is reached.
0
Figure
warning state
IT+(AVD)
16.
IT+(AVD)