ST STM32WL55JC Reference Manual page 11

Advanced arm-based 32-bit mcus with sub-ghz radio solution
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RM0453
7.4.34
7.4.35
7.4.36
7.4.37
7.4.38
7.4.39
7.4.40
7.4.41
7.4.42
7.4.43
7.4.44
7.4.45
7.4.46
7.4.47
8
Hardware semaphore (HSEM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
8.1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
8.2
Main features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364
8.3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
8.3.1
8.3.2
8.3.3
8.3.4
8.3.5
8.3.6
8.3.7
8.3.8
RCC CPU2 AHB2 peripheral clock enable register
(RCC_C2AHB2ENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
RCC CPU2 AHB3 peripheral clock enable register
(RCC_C2AHB3ENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 343
RCC CPU2 APB1 peripheral clock enable register 1
(RCC_C2APB1ENR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344
RCC CPU2 APB1 peripheral clock enable register 2
(RCC_C2APB1ENR2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 345
RCC CPU2 APB2 peripheral clock enable register
(RCC_C2APB2ENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
RCC CPU2 APB3 peripheral clock enable register
(RCC_C2APB3ENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
RCC CPU2 AHB1 peripheral clock enable in Sleep mode register
(RCC_C2AHB1SMENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 348
RCC CPU2 AHB2 peripheral clock enable in Sleep mode register
(RCC_C2AHB2SMENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
RCC CPU2 AHB3 peripheral clock enable in Sleep mode register
(RCC_C2AHB3SMENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
RCC CPU2 APB1 peripheral clock enable in Sleep mode register 1
(RCC_C2APB1SMENR1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
RCC CPU2 APB1 peripheral clock enable in Sleep mode register 2
(RCC_C2APB1SMENR2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353
RCC CPU2 APB2 peripheral clock enable in Sleep mode register
(RCC_C2APB2SMENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
RCC CPU2 APB3 peripheral clock enable in Sleep mode register
(RCC_C2APB3SMENR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 355
RCC register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356
HSEM block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
HSEM internal signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
HSEM lock procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 365
HSEM write/read/read lock register address . . . . . . . . . . . . . . . . . . . . 367
HSEM unlock procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367
HSEM COREID semaphore clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368
HSEM interrupts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 368
AHB bus master ID verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 370
RM0453 Rev 2
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