Table 82. Exti Event Input Configurations And Register Control - STMicroelectronics STM32WLEx Reference Manual

RM0461
14.4 EXTI functional description
Depending on the EXTI event input type and wakeup targets, different logic implementations
are used. The applicable features are controlled from register bits as detailed below:
•
Active trigger edge enable
-
-
•
Software trigger
EXTI software interrupt event register (EXTI_SWIER1)
EXTI software interrupt event register (EXTI_SWIER2)
•
Interrupt pending flag
EXTI pending register (EXTI_PR1)
EXTI pending register (EXTI_PR2)
• CPU wakeup and interrupt enable
EXTI interrupt mask register (EXTI_IMR1)
EXTI interrupt mask register (EXTI_IMR2)
•
CPU wakeup and event enable
EXTI event mask register (EXTI_EMR1)

Table 82. EXTI event input configurations and register control

Event input
type
Configurable Configurable event input wakeup logic
Direct Direct event input wakeup logic
1. Only for input events with configuration "rxev generation" enabled.
14.4.1 EXTI configurable event input wakeup
The extended interrupt/event block diagram for configurable events is shown in
The configurable events allow the system and CPU wakeup from Sleep and Stop modes,
and provide a pending flag in the EXTI.
by rising edge selection
EXTI rising trigger selection register (EXTI_RTSR1)
EXTI rising trigger selection register (EXTI_RTSR2)
by falling edge selection
EXTI falling trigger selection register (EXTI_FTSR1)
EXTI falling trigger selection register (EXTI_FTSR2)
Logic implementation
Extended interrupts and event controller (EXTI)
EXTI_ EXTI_
RTSR FTSR
x x
- -
RM0461 Rev 5
EXTI_ EXTI_ EXTI_
SWIER PR IMR
x x x
- - x
EXTI_
(1)
EMR
x
x
Figure 41.
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