ST STM32F412 User Manual

RM0402 Rev 6 865/1163
RM0402 Secure digital input/output interface (SDIO)
921
Figure 307. Sequential read operation
Figure 308. Sequential write operation
27.3 SDIO functional description
The SDIO consists of two parts:
• The SDIO adapter block provides all functions specific to the MMC/SD/SD I/O card
such as the clock generation unit, command and data transfer.
• The APB2 interface accesses the SDIO adapter registers, and generates interrupt and
DMA request signals.
Figure 309. SDIO block diagram
MSv36071V1
Data stop operation
From card to host
Stop command
stops data transfer
Command Response Command Response
Data stream
Data transfer operation
From host to
card(s)
Data from card to host
SDIO_CMD
SDIO_D
MSv36072V1
Data stop operation
From card to host
Stop command
stops data transfer
ResponseCommand ResponseCommand
Data stream
Data transfer operation
From host to
card(s)
Data from host to card
SDIO_CMD
SDIO_D
MSv36073V1
APB2 bus
APB2
Interrupts and
PCLK2
SDIO_CK
interface
DMA request
SDIOCLK
SDIO_D[7:0]
SDIO_CMD
SDIO
SDIO
adapter

ST STM32F412 Specifications

General

Brand	ST
Model	STM32F412
Category	Microcontrollers
Language	English