ST7FLITE05Y0B6 FARNELL, ST7FLITE05Y0B6 Datasheet - Page 34

• Manufacturer Part Number: ST7FLITE05Y0B6
• Description: IC, 8BIT MCU, ST7, 16MHZ, DIP-16
• Manufacturer: FARNELL

Specifications of ST7FLITE05Y0B6

• Controller Family/series: ST7
• No. Of I/o's: 13
• Ram Memory Size: 128Byte
• Cpu Speed: 16MHz
• No. Of Timers: 2
• Interface: SPI
• Core Size: 8 Bit
• Program Memory Size: 1.5 Kb
• Peripherals: ADC, PWM, Timer
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ST7LITE0xY0, ST7LITESxY0
SYSTEM INTEGRITY MANAGEMENT (Cont’d)
8.4.2 Auxiliary Voltage Detector (AVD)
The Voltage Detector function (AVD) is based on
an analog comparison between a V
V
ply voltage (V
for falling voltage is lower than the V
ence value for rising voltage in order to avoid par-
asitic 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 functions only if the LVD is en-
abled through the option byte.
Figure 21. Using the AVD to Monitor V
34/124
1
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)
reference value and the V
V
AVD
DD
). The V
0
IT-(AVD)
1
reference value
IT+(AVD)
DD
INTERRUPT Cleared by
IT-(AVD)
main sup-
V
Early Warning Interrupt
(Power has dropped, MCU not
not yet in reset)
DD
hyst
refer-
reset
and
RESET
8.4.2.1 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 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
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
IT-(AVD)
section 15.1 on page
threshold (AVDF bit is set).
Figure
21.
1
DD
INTERRUPT Cleared by
DD
112).
warning state is over
Main Supply
hardware
0
IT+(LVD)
or