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STM32F412xE/G Electrical characteristics
161
6.3.27 RTC characteristics
CMD, D inputs (referenced to CK) in SD default mode
t
ISUD
Input setup time SD fpp =25MHz
2.5 - -
ns
t
IHD
Input hold time SD fpp =25MHz
2.5 - -
CMD, D outputs (referenced to CK) in SD default mode
t
OVD
Output valid default time SD fpp =25 MHz
-1.52
ns
t
OHD
Output hold default time SD fpp =25 MHz
0.5 - -
1. Guaranteed by characterization results, not tested in production.
2. V
DD
= 2.7 to 3.6 V.
Table 95. Dynamic characteristics: SD / MMC characteristics
(1)(2)
(continued)
Symbol Parameter Conditions Min Typ Max Unit
Table 96. Dynamic characteristics: eMMC characteristics V
DD
= 1.7 V to 1.9 V
(1)(2)
Symbol Parameter Conditions Min Typ Max Unit
f
PP
Clock frequency in data transfer mode - 0 - 50 MHz
- SDIO_CK/fPCLK2 frequency ratio - - - 8/3 -
t
W(CKL)
Clock low time fpp =50MHz 9.5 10.5 -
ns
t
W(CKH)
Clock high time fpp =50MHz 8.5 9.5 -
CMD, D inputs (referenced to CK) in eMMC mode
t
ISU
Input setup time HS fpp =50MHz 3.5 - -
ns
t
IH
Input hold time HS fpp =50MHz 4 - -
CMD, D outputs (referenced to CK) in eMMC mode
t
OV
Output valid time HS fpp =50MHz - 13.5 15
ns
t
OH
Output hold time HS fpp =50MHz 12 - -
1. Guaranteed by characterization results, not tested in production.
2. C
LOAD
= 20 pF.
Table 97. 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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