STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

RM0008
Connectivity line devices: reset and clock control (RCC)
7.3.6 AHB Peripheral Clock enable register (RCC_AHBENR)
Address offset: 0x14
Reset value: 0x0000 0014
Access: no wait state, word, half-word and byte access
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Reserved
ETH
MACR
XEN
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
rw
ETHM
ACTX
EN
ETHM
ACEN
Res.
OTGF
SEN
Reserved
CRCEN
Res.
FLITFE
N
Res.
SRAM
EN
DMA2
EN
DMA1
EN
rw rw rw rw rw rw rw rw
Bits 31:17 Reserved, always read as 0.
Bit 16 ETHMACRXEN: Ethernet MAC RX clock enable
Set and cleared by software.
0: Ethernet MAC RX clock disabled
1: Ethernet MAC RX clock enabled
Note: In the RMII mode, if this clock is enabled, the RMII clock of the MAC is also enabled.
Bit 15 ETHMACTXEN: Ethernet MAC TX clock enable
Set and cleared by software.
0: Ethernet MAC TX clock disabled
1: Ethernet MAC TX clock enabled
Note: In the RMII mode, if this clock is enabled, the RMII clock of the MAC is also enabled.
Bit 14 ETHMACEN: Ethernet MAC clock enable
Set and cleared by software. Selection of PHY interface (MII/RMII) must be done before
enabling the MAC clock.
0: Ethernet MAC clock disabled
1: Ethernet MAC clock enabled
Bit 13 Reserved, always read as 0.
Bit 12 OTGFSEN: USB OTG FS clock enable
Set and cleared by software.
0: USB OTG FS clock disabled
1: USB OTG FS clock enabled
Bits 11:7 Reserved, always read as 0.
Bit 6 CRCEN: CRC clock enable
Set and cleared by software.
0: CRC clock disabled
1: CRC clock enabled
Bit 5 Reserved, always read as 0.
Doc ID 13902 Rev 9 125/995