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STMicroelectronics STM32F405 User Manual

STMicroelectronics STM32F405
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DocID018909 Rev 11 1053/1731
RM0090 Secure digital input/output interface (SDIO)
1067
31.9.2 SDI clock control register (SDIO_CLKCR)
Address offset: 0x04
Reset value: 0x0000 0000
The SDIO_CLKCR register controls the SDIO_CK output clock.
313029282726252423222120191817161514131211109876543210
Reserved
HWFC_EN
NEGEDGE
WID
BUS
BYPASS
PWRSAV
CLKEN
CLKDIV
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bits 31:15 Reserved, must be kept at reset value
Bit 14 HWFC_EN: HW Flow Control enable
0b: HW Flow Control is disabled
1b: HW Flow Control is enabled
When HW Flow Control is enabled, the meaning of the TXFIFOE and RXFIFOF interrupt
signals, please see SDIO Status register definition in Section 31.9.11.
Bit 13 NEGEDGE:SDIO_CK dephasing selection bit
0b: SDIO_CK generated on the rising edge of the master clock SDIOCLK
1b: SDIO_CK generated on the falling edge of the master clock SDIOCLK
Bits 12:11 WIDBUS: Wide bus mode enable bit
00: Default bus mode: SDIO_D0 used
01: 4-wide bus mode: SDIO_D[3:0] used
10: 8-wide bus mode: SDIO_D[7:0] used
Bit 10 BYPASS: Clock divider bypass enable bit
0: Disable bypass: SDIOCLK is divided according to the CLKDIV value before driving the
SDIO_CK output signal.
1: Enable bypass: SDIOCLK directly drives the SDIO_CK output signal.
Bit 9 PWRSAV: Power saving configuration bit
For power saving, the SDIO_CK clock output can be disabled when the bus is idle by setting
PWRSAV:
0: SDIO_CK clock is always enabled
1: SDIO_CK is only enabled when the bus is active
Bit 8 CLKEN: Clock enable bit
0: SDIO_CK is disabled
1: SDIO_CK is enabled
Bits 7:0 CLKDIV: Clock divide factor
This field defines the divide factor between the input clock (SDIOCLK) and the output clock
(SDIO_CK): SDIO_CK frequency = SDIOCLK / [CLKDIV + 2].

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STMicroelectronics STM32F405 Specifications

General IconGeneral
BrandSTMicroelectronics
ModelSTM32F405
CategoryController
LanguageEnglish

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