TS80C51RA2_08 Datasheet, PDF (66/86 Pages) ATMEL Corporation – High Performance 8-bit Microcontroller

11.5.4
External Data Memory Characteristics
Symbol
T_RLRH
T_WLWH
T_RLDV
T_RHDX
T_RHDZ
T_LLDV
T_AVDV
T_LLWL
T_AVWL
T_QVWX
T_QVWH
T_WHQX
T_RLAZ
T_WHLH
Parameter
RD Pulse Width
WR Pulse Width
RD to Valid Data In
Data Hold After RD
Data Float After RD
ALE to Valid Data In
Address to Valid Data In
ALE to WR or RD
Address to WR or RD
Data Valid to WR Transition
Data set-up to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE high
Speed
Symbol
T_RLRH
T_WLWH
T_RLDV
T_RHDX
T_RHDZ
T_LLDV
T_AVDV
T_LLWL
T_AVWL
T_QVWX
T_QVWH
T_WHQX
T_RLAZ
T_WHLH
Table 11-8. AC Parameters for a Fix Clock
-M
40 MHz
Min
Max
130
130
100
0
30
160
165
50
100
75
10
160
15
0
10
40
-V
X2 mode
30 MHz
60 MHz equiv.
Min
Max
85
85
60
0
18
98
100
30
70
47
7
107
9
0
7
27
-V
standard mode 40
MHz
Min
Max
135
135
102
0
35
165
175
55
95
80
15
165
17
0
15
35
-L
X2 mode
20 MHz
40 MHz equiv.
Min
Max
125
125
95
0
25
155
160
45
105
70
5
155
10
0
5
45
66 AT/TS8xC51Rx2
-L
standard mode
30 MHz
Min
Max
175
175
137
0
42
222
235
70
130
103
13
213
18
0
13
53
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
4188F–8051–01/08