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No Longer Valid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
