Datasheet

229
4341H–MP3–10/07
AT8xC51SND2C/MP3B
24.4.1.2 Waveforms
Figure 24-23. Two Wire Waveforms
24.4.2 MMC Interface
24.4.2.1 Definition of symbols
Table 24-20. MMC Interface Timing Symbol Definitions
24.4.2.2 Timings
Table 24-21. MMC Interface AC timings
V
DD
= 2.7 to 3.3 V, T
A
= -40 to +85°C, CL ≤ 100pF (10 cards)
Tsu;DAT1
T
su
;STA
Tsu;DAT 2
T
hd
;STA
T
high
T
low
SDA
(INPUT/OUTPUT)
0.3 V
DD
0.7 V
DD
T
buf
T
su
;STO
0.7 V
DD
0.3 V
DD
T
rd
T
fd
T
rc
T
fc
SCL
(INPUT/OUTPUT)
T
hd;
DAT
T
su;
DAT3
START or Repeated START condition
START condition
STOP condition
Repeated START condition
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X No Longer Valid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