Reset and clock control (RCC) RM0453
320/1461 RM0453 Rev 1
7.4.17 RCC AHB3 peripheral clock enable register (RCC_AHB3ENR)
Address offset: 0x050
Reset value: 0x0208 0000
Access: no wait state, word, half-word and byte access
Note: When the peripheral clock is not active, the peripheral registers read or write access from
CPU1 is not supported.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res.
FLASH
EN
Res. Res. Res. Res.
IPCC
EN
HSEM
EN
RNG
EN
AES
EN
PKA
EN
rw rw rw rw rw rw
1514131211109 8 76543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
Bits 31:26 Reserved, must be kept at reset value.
Bit 25 FLASHEN: CPU1 Flash memory interface clock enable
This bit can only be cleared when the Flash memory is in power down. Set and cleared by
software.
0: Flash interface clock disabled for CPU1
1: Flash interface clock enabled for CPU1
Bits 24:21 Reserved, must be kept at reset value.
Bit 20 IPCCEN: CPU1 IPCC interface clock enable
This bit is set and cleared by software.
0: IPCC clock disabled for CPU1
1: IPCC clock enabled for CPU1
Bit 19 HSEMEN: CPU1 HSEM clock enable
This bit is set and cleared by software.
0: HSEM clock disabled for CPU1
1: HSEM clock enabled for CPU1
Bit 18 RNGEN: CPU1 true RNG clocks enable
This bit is set and cleared by software.
0: True RNG bus and kernel clocks disabled for CPU1
1: True RNG bus and kernel clocks enabled for CPU1
Bit 17 AESEN: CPU1 AES accelerator clock enable
This bit is set and cleared by software.
0: AES clock disabled for CPU1
1: AES clock enabled for CPU1
Bit 16 PKAEN: CPU1 PKA accelerator clock enable
This bit is set and cleared by software.
PKA clock is enabled when a hardware PKA SRAM erase is ongoing.
0: PKA clock disabled for CPU1
1: PKA clock enabled for CPU1
Bits 15:0 Reserved, must be kept at reset value.
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