STM32F437XX Datasheet, PDF (197/240 Pages) STMicroelectronics – ARM Cortex-M4 32b MCU+FPU, 225DMIPS, up to 2MB Flash/256+4KB RAM, crypto, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera&LCD-TFT

STM32F437xx and STM32F439xx
Electrical characteristics
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
TF
TR
T7#+(
#+
$#-$
OUTPUT
$#-$
INPUT
T#
T/6
T7#+,
T/(
T)35
T)(
Figure 79. SD default mode
#+
$#-$
OUTPUT
T/6$
T/($
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