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ST72321 Datasheet(PDF) 29 Page - STMicroelectronics

Part # ST72321
Description  8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C INTERFACE
PDF  185 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321 Datasheet(HTML) 29 Page - STMicroelectronics

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SYSTEM INTEGRITY MANAGEMENT (Cont’d)
6.4.2.2 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 in-
terrupt is generated on the rising and falling edges
of the comparator output. This means it is generat-
ed when either one of these two events occur:
–VEVD rises up to VIT+(EVD)
–VEVD falls down to VIT-(EVD)
The EVD function is illustrated in Figure 16.
For more details, refer to the Electrical Character-
istics section.
Figure 16. Using the Voltage Detector to Monitor the EVD pin (AVDS bit=1)
VEVD
VIT+(EVD)
VIT-(EVD)
AVDF
0
0
1
IF AVDIE = 1
Vhyst
AVD INTERRUPT
REQUEST
INTERRUPT PROCESS
INTERRUPT PROCESS



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