ST72521R9-Auto STMicroelectronics, ST72521R9-Auto Datasheet - Page 95

• Manufacturer Part Number: ST72521R9-Auto
• Description: 8-bit MCU for automotive
• Manufacturer: STMicroelectronics

Specifications of ST72521R9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years
• Clock Sources: crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
• 4 Power Saving Modes: Halt, Active Halt, Wait and Slow

ST72521xx-Auto
12.2.9
External interrupt capability
This mode allows the input capture capabilities to be used as external interrupt sources. The
interrupts are generated on the edge of the ARTICx signal.
The edge sensitivity of the external interrupts is programmable (CSx bit of ARTICCSR
register) and they are independently enabled through CIEx bits of the ARTICCSR register.
After fetching the interrupt vector, the CFx flags can be read to identify the interrupt source.
During Halt mode, the external interrupts can be used to wake up the micro (if the CIEx bit is
set).
Figure 40. Input capture timing diagram
ICRx REGISTER
ARTICx PIN
COUNTER
CFx FLAG
f
COUNTER
01h
Doc ID 17660 Rev 1
02h
xxh
03h
04h
05h
INTERRUPT
PWM auto-reload timer (ART)
04h
06h
07h
t
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