ST7DALIF2 STMicroelectronics, ST7DALIF2 Datasheet - Page 42

• Manufacturer Part Number: ST7DALIF2
• Description: 8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, DATA EEPROM, ADC, TIMERS, SPI
• Manufacturer: STMicroelectronics

Specifications of ST7DALIF2

• 8 Kbytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit Programming And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• 256 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C.
• Clock Sources: Internal 1% RC oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-Halt, Wait and Slow, Auto Wake Up From Halt

Supply, reset and clock management
9.7.2
Caution:
42/171
Figure 17. Reset and supply management block diagram
Auxiliary voltage detector (AVD)
The Voltage Detector function (AVD) is based on an analog comparison between a V
and V
reference value for falling voltage is lower than the V
voltage in order to avoid parasitic detection (hysteresis).
The output of the AVD comparator is directly readable by the application software through a
real time status bit (AVDF) in the SICSR register. This bit is read only.
The AVD functions only if the LVD is enabled through the option byte.
Monitoring the V
The AVD voltage threshold value is relative to the selected LVD threshold configured by
option byte (see
If the AVD interrupt is enabled, an interrupt is generated when the voltage crosses the
V
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
IT+(LVD)
RESET
V
V
SS
DD
IT+(AVD)
or V
IT-(AVD)
reference value and the V
Section 22.1 on page
RESET SEQUENCE
DD
threshold (AVDF bit is set).
MANAGER
(RSM)
main supply
TIMER (WDG)
WATCHDOG
161).
DD
SICSR
main supply voltage (V
0
SYSTEM INTEGRITY MANAGEMENT
0
0
IT+(AVD)
WDGRF
AUXILIARY VOLTAGE
LOCKED
LOW VOLTAGE
STATUS FLAG
reference value for rising
DETECTOR
DETECTOR
(AVD)
(LVD)
LVDRF
AVD
). The V
AVDF
AVD Interrupt Request
AVDIE
Figure
IT-(AVD)
ST7DALIF2
18.
IT-(AVD)