AT89C51SND1C-ROTIL ATMEL Corporation, AT89C51SND1C-ROTIL Datasheet - Page 30

• Manufacturer Part Number: AT89C51SND1C-ROTIL
• Description: Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
• Manufacturer: ATMEL Corporation

Waveforms
30
AT8xC51SND1C
Table 41. External 8-bit Bus Cycle – Data Write AC Timings
V
Figure 15. External 8-bit Bus Cycle – Data Read Waveforms
Symbol
DD
T
T
T
T
T
T
T
T
T
T
WLWH
QVWH
WHQX
WHLH
AVWL
CLCL
LLWL
LHLL
AVLL
LLAX
= 2.7 to 3.3V, T
ALE
RD
P0
P2
Parameter
Clock Period
ALE Pulse Width
Address Valid to ALE Low
Address Hold after ALE
Low
ALE Low to WR Low
WR Pulse Width
WR High to ALE High
Address Valid to WR Low
Data Valid to WR High
Data Hold after WR High
A
= -40° to +85°C
T
LHLL
T
AVLL
A7:0
T
AVRL
T
T
T
LLAX
2·T
3·T
6·T
4·T
7·T
T
RLAZ
LLRL
T
T
T
T
AVDV
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
Min
50
Standard Mode
Variable Clock
-20
-20
-20
-15
-15
-30
-25
-30
-20
T
RLDV
T
CLCL
Max
T
A15:8
RLRH
+20
0.5·T
0.5·T
1.5·T
0.5·T
3.5·T
0.5·T
Data In
3·T
2·T
T
D7:0
CLCL
Min
CLCL
CLCL
50
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
T
Variable Clock
-15
-25
-30
RHDX
T
-20
-20
-30
-20
-20
-15
X2 Mode
RHDZ
T
RHLH
0.5·T
Max
CLCL
4106F–8051–10/02
+20
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns