
34
4109LS–8051–02/08
AT8xC51SND1C
7.4.2
MMC Interface
7.4.2.1
Definition of symbols
Table 35. MMC Interface Timing Symbol Definitions
7.4.2.2
Timings
Table 36. MMC Interface AC timings
VDD = 2.7 to 3.3 V, TA = -40 to +85°C, CL ≤ 100pF (10 cards)
7.4.2.3
Waveforms
Figure 7-19. MMC Input-Output Waveforms
Signals
Conditions
C
Clock
H
High
D
Data In
L
Low
O
Data Out
V
Valid
X
No Longer Valid
Symbol
Parameter
Min
Max
Unit
T
CHCH
Clock Period
50
ns
T
CHCX
Clock High Time
10
ns
T
CLCX
Clock Low Time
10
ns
T
CLCH
Clock Rise Time
10
ns
T
CHCL
Clock Fall Time
10
ns
T
DVCH
Input Data Valid to Clock High
3
ns
T
CHDX
Input Data Hold after Clock High
3
ns
T
CHOX
Output Data Hold after Clock High
5
ns
T
OVCH
Output Data Valid to Clock High
5
ns
T
IVCH
MCLK
MDAT Input
TCHCH
TCLCX
TCHCX
TCHCL
TCLCH
MCMD Input
T
CHIX
T
OVCH
MDAT Output
MCMD Output
T
CHOX