Datasheet

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STM32F405xx, STM32F407xx Electrical characteristics
Figure 75. SD default mode
5.3.28 RTC characteristics
CK
D, CMD
(output)
t
OVD
t
OHD
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Table 88. Dynamic characteristics: SD / MMC characteristics
(1)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode 0 48 MHz
SDIO_CK/f
PCLK2
frequency ratio - - 8/3 -
t
W(CKL)
Clock low time fpp = 48 MHz 8.5 9 -
ns
t
W(CKH)
Clock high time fpp = 48 MHz 8.3 10 -
CMD, D inputs (referenced to CK) in MMC and SD HS mode
t
ISU
Input setup time HS fpp = 48 MHz 3 - -
ns
t
IH
Input hold time HS fpp = 48 MHz 0 - -
CMD, D outputs (referenced to CK) in MMC and SD HS mode
t
OV
Output valid time HS fpp = 48 MHz - 4.5 6
ns
t
OH
Output hold time HS fpp = 48 MHz 1 - -
CMD, D inputs (referenced to CK) in SD default mode
t
ISUD
Input setup time SD fpp = 24 MHz 1.5 - -
ns
t
IHD
Input hold time SD fpp = 24 MHz 0.5 - -
CMD, D outputs (referenced to CK) in SD default mode
t
OVD
Output valid default time SD fpp = 24 MHz - 4.5 7
ns
t
OHD
Output hold default time SD fpp = 24 MHz 0.5 - -
1. Data based on characterization results, not tested in production.
Table 89. RTC characteristics
Symbol Parameter Conditions Min Max
-f
PCLK1
/RTCCLK frequency ratio
Any read/write operation
from/to an RTC register
4-