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STM32F427xx STM32F429xx Electrical characteristics
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6.3.29  SD/SDIO MMC card host interface (SDIO) characteristics
Unless otherwise specified, the parameters given in Table 108 for the SDIO/MMC interface 
are derived from tests performed under the ambient temperature, f
PCLK2 
frequency and V
DD
 
supply voltage conditions summarized in Table 17, with the following configuration: 
• Output speed is set to OSPEEDRy[1:0] = 10
• Capacitive load C = 30 pF
• Measurement points are done at CMOS levels: 0.5V
DD
Refer to Section 6.3.17: I/O port characteristics for more details on the input/output 
characteristics.
Figure 78. SDIO high-speed mode
Figure 79. SD default mode
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