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28
4173ES–USB–09/07
AT89C5132
6.3.5 MMC Interface
6.3.5.1 Definition of Symbols
Table 14. MMC Interface Timing Symbol Definitions
6.3.5.2 Timings
Table 15. MMC Interface AC Timings
V
DD
= 2.7 to 3.3 V, T
A
= -40 to +85°C, CL ≤ 100pF (10 cards)
6.3.5.3 Waveforms
Figure 6-17. 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X No Longer Valid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
T
CHCH
T
CLCX
T
CHCX
T
CHCL
T
CLCH
MCMD Input
T
CHIX
T
OVCH
MDAT Output
MCMD Output
T
CHOX