ST72521 STMICROELECTRONICS [STMicroelectronics], ST72521 Datasheet - Page 30

• Manufacturer Part Number: ST72521
• Description: 8-BIT MCU WITH NESTED INTERRUPTS, FLASH, 10-BIT ADC, FIVE TIMERS, SPI, SCI, I2C, CAN INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

ST72521
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
Figure 16. Using the Voltage Detector to Monitor the EVD pin (AVDS bit=1)
30/211
AVDF
AVD INTERRUPT
REQUEST
IF AVDIE = 1
V
V
IT+(EVD)
IT-(EVD)
V
EVD
0
INTERRUPT PROCESS
V
hyst
1
of the comparator output. This means it is generat-
ed when either one of these two events occur:
The EVD function is illustrated in
For more details, refer to the Electrical Character-
istics section.
– V
– V
EVD
EVD
rises up to V
falls down to V
IT+(EVD)
IT-(EVD)
INTERRUPT PROCESS
Figure
0
16.