T89C51RD2-3CSCM 查看數據表（PDF） - Atmel Corporation
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T89C51RD2-3CSCM Datasheet PDF : 104 Pages
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External Data Memory
Characteristics
Table 48. Symbol Description
Symbol
Parameter
TRLRH
RD Pulse Width
TWLWH
WR Pulse Width
TRLDV
RD to Valid Data In
TRHDX
Data Hold After RD
TRHDZ
Data Float After RD
TLLDV
ALE to Valid Data In
TAVDV
Address to Valid Data In
TLLWL
ALE to WR or RD
TAVWL
Address to WR or RD
TQVWX
Data Valid to WR Transition
TQVWH
Data set-up to WR High
TWHQX
Data Hold After WR
TRLAZ
RD Low to Address Float
TWHLH
RD or WR High to ALE high
Table 49. AC Parameters for a Fix Clock
Symbol
TRLRH
TWLWH
TRLDV
TRHDX
TRHDZ
TLLDV
TAVDV
TLLWL
TAVWL
TQVWX
TQVWH
TWHQX
TRLAZ
TWHLH
-M
Min
130
130
0
50
75
10
160
15
10
Max
100
30
160
165
100
0
40
88 T89C51RD2
-L
Min
Max
130
130
100
0
30
160
165
50
100
75
10
160
15
0
10
40
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
4243G–8051–05/03
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