23.3.5
MMC Interface
23.3.5.1
Definition of Symbols
Table 116. MMC Interface Timing Symbol Definitions
Signals
Clock
Conditions
High
C
D
O
H
L
Data In
Low
Data Out
V
X
Valid
No Longer Valid
23.3.5.2
Timings
Table 117. MMC Interface AC Timings
DD = 2.7 to 3.3 V, TA = -40 to +85°C, CL ≤ 100pF (10 cards)
V
Symbol
Parameter
Min
50
Max
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
TCHCH
Clock Period
TCHCX
TCLCX
TCLCH
TCHCL
TDVCH
TCHDX
TCHOX
TOVCH
Clock High Time
10
Clock Low Time
10
Clock Rise Time
10
10
Clock Fall Time
Input Data Valid to Clock High
Input Data Hold after Clock High
Output Data Hold after Clock High
Output Data Valid to Clock High
3
3
5
5
23.3.5.3
Waveforms
Figure 23-17. MMC Input Output Waveforms
TCHCH
TCHCX
TCLCX
MCLK
TCHCL
TCLCH
TIVCH
TCHIX
MCMD Input
MDAT Input
TCHOX
TOVCH
MCMD Output
MDAT Output
168
AT89C5132
4173E–USB–09/07
ATMEL [ ATMEL ]
