ST STM32F301 6 Series Reference Manual page 179

RM0366
generation, in addition, the internal lines are sampled only in STOP mode. This controller
allows also to emulate the (only) external events by software, multiplexed with the
corresponding hardware event line, by writing to a dedicated register.
11.2.1 Main features
The EXTI main features are the following:
•
support generation of up to 36 event/interrupt requests
•
Independent configuration of each line as an external or an internal event requests
•
Independent mask on each event/interrupt line
•
Automatic disable of internal lines when system is not in STOP mode
•
Independent trigger for external event/interrupt line
•
Dedicated status bit for external interrupt line
•
Emulation for all the external event requests.
11.2.2 Block diagram
The extended interrupt/event block diagram is shown in the following figure.
Figure 22. External interrupt/event block diagram
PCLK
28
Pending
request
register
To NVIC interrupt
controller
28
Pulse
generator
28 28
AMBA APB bus
Peripheral interface
28
28
Software
Interrupt
interrupt
mask
event selection
register
register register
28 28
28
Event
mask
register
RM0366 Rev 5
Interrupts and events
28 28
Rising
Falling
trigger trigger
selection
register
28
28
Input
Edge detect
circuit
line
MS30250V1
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