ST STM32WL5 Series User Manual

Extended interrupts and event controller (EXTI) RM0453
510/1461 RM0453 Rev 1
16.4 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
– 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)
• 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_CnIMR1)
EXTI interrupt mask register (EXTI_CnIMR2)
• CPU wakeup and event enable
EXTI event mask register (EXTI_CnEMR1)
EXTI event mask register (EXTI_CnEMR2)
45 Radio Busy RFBUSY wakeup Configurable No CPU1 and CPU2
46 CDBGPWRUPREQ Debug power-up request wakeup Direct No CPU1 and CPU2
1. For correct operation, the EXTI direct event EXTI_C2IMRm.IMb bit must be set to 0 before CPU1 uses this di-
rect event.
2. For correct operation, the EXTI direct event EXTI_C1IMRm.IMb bit must be set to 0 before CPU2 uses this di-
rect event.
3. For correct operation, the EXTI configurable event EXTI_C2IMRm.IMb and EXTI_C2EMRm.EMb bits must
both be set to 0 before CPU1 uses this configurable event.
4. For correct operation, the EXTI configurable event EXTI_C1IMRm.IMb and EXTI_C1EMRm.EMb bits must
both be set to 0 before CPU2 uses this configurable event.
Table 93. Wakeup interrupts (continued)
EXTI
n
o
Acronym Description EXTI type Event Wakeup
Table 94. EXTI event input configurations and register control
Event input
type
Logic implementation
EXTI_
RTSR
EXTI_
FTSR
EXTI_
SWIER
EXTI_
PR
EXTI_
CnIMR
EXTI_
CnEMR
(1)
Configurable Configurable event input wakeup logic x x x x x x
Direct Direct event input wakeup logic - - - - x x

ST STM32WL5 Series Specifications

General

Brand	ST
Model	STM32WL5 Series
Category	Microcontrollers
Language	English