Datasheet

DS6329 Rev 16 151/184
STM32F20xxx Electrical characteristics
183
Figure 76. SD default mode
6.3.28 RTC characteristics
Table 85. SD/MMC characteristics
Symbol Parameter Conditions Min Max Unit
f
PP
Clock frequency in data transfer
mode
C
L
≤ 30 pF 0 48 MHz
- SDIO_CK/f
PCLK2
frequency ratio - - 8/3 -
t
W(CKL)
Clock low time, f
PP
= 16 MHz C
L
≤ 30 pF 32 -
ns
t
W(CKH)
Clock high time, f
PP
= 16 MHz C
L
≤ 30 pF 31 -
t
r
Clock rise time C
L
≤ 30 pF - 3.5
t
f
Clock fall time C
L
≤ 30 pF - 5
CMD, D inputs (referenced to CK)
t
ISU
Input setup time C
L
≤ 30 pF 2 -
ns
t
IH
Input hold time C
L
≤ 30 pF 0 -
CMD, D outputs (referenced to CK) in MMC and SD HS mode
t
OV
Output valid time C
L
≤ 30 pF - 6
ns
t
OH
Output hold time C
L
≤ 30 pF 0.3 -
CMD, D outputs (referenced to CK) in SD default mode
(1)
1. Refer to SDIO_CLKCR, the SDI clock control register to control the CK output.
t
OVD
Output valid default time C
L
≤ 30 pF - 7
ns
t
OHD
Output hold default time C
L
≤ 30 pF 0.5 -
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Table 86. 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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