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Electrical characteristics STM32F427xx STM32F429xx
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6.3.30 RTC characteristics
Table 108. Dynamic characteristics: SD / MMC characteristics
(1)(2)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode 0 48 MHz
- SDIO_CK/fPCLK2 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 3.5 - -
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 7
ns
t
OH
Output hold time HS fpp =48 MHz 3 - -
CMD, D inputs (referenced to CK) in SD default mode
tISUD InputsetuptimeSD
fpp =24 MHz
1.5 - -
ns
tIHD InputholdtimeSD
fpp =24 MHz
0.5 - -
CMD, D outputs (referenced to CK) in SD default mode
tOVD OutputvaliddefaulttimeSD fpp =24 MHz
-4.56.5
ns
tOHD OutputholddefaulttimeSD
fpp =24 MHz
3.5 - -
1. Guaranteed by characterization results.
2. V
DD
= 2.7 to 3.6 V.
Table 109. RTC characteristics
Symbol Parameter Conditions Min Max
-f
PCLK1
/RTCCLK
frequency ratio
Any read/write operation
from/to an RTC register
4-
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