ST7LITE49M STMicroelectronics, ST7LITE49M Datasheet - Page 42

• Manufacturer Part Number: ST7LITE49M
• Description: 8-bit MCU
• Manufacturer: STMicroelectronics

Specifications of ST7LITE49M

• 4 Kbytes Single Voltage Extended Flash (xflash) Program Memory With Read-out Protection In-circuit Programming And In-application Programming (icp And Iap) Endurance: 10k write/erase cycles guaranteed Data retention
• 128 Bytes Data Eeprom With Read-out Protection. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55 °C.
• Clock Sources: Internal trimmable 8 MHz RC oscillator, auto-wakeup internal low power - low frequency oscillator, crystal/ceramic resonator or external clock
• Five Power Saving Modes: Halt, Active-halt, Auto-wakeup from Halt, Wait and Slow
• A/d Converter: 10 input channels

Supply, reset and clock management
7.4.2
42/188
Figure 17. Low voltage detector vs reset
Figure 18. 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.
Monitoring the V
The AVD threshold is selected by the AVD[1:0] bits in the AVDTHCR register.
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
The interrupt on the rising edge is used to inform the application that the V
is over.
RESET
IT+(AVD)
V
V
V
V
RESET
SS
DD
IT+(LVD)
IT-(LVD)
IT+(AVD)
or V
V
DD
IT-(AVD)
reference value and the V
RESET SEQUENCE
MANAGER
DD
(RSM)
threshold (AVDF bit is set).
main supply
TIMER (WDG)
WATCHDOG
Doc ID 13562 Rev 3
SICSR
SYSTEM INTEGRITY MANAGEMENT
DD
0
main supply voltage (V
CR1
V
hys
CR0
AUXILIARY VOLTAGE
WDGF
IT+(AVD)
LOW VOLTAGE
DETECTOR
DETECTOR
STATUS FLAG
0
(AVD)
(LVD)
LVDRF
reference value for rising
AVDF
AVD
AVD Interrupt Request
AVDIE
). The V
DD
Figure
IT-(AVD)
warning state
ST7LITE49M
19.
IT-(AVD)