t89c51rd2-slscl ATMEL Corporation, t89c51rd2-slscl Datasheet - Page 88

• Manufacturer Part Number: t89c51rd2-slscl
• Description: 0 To 40 Mhz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL Corporation

External Data Memory
Characteristics
Table 48. Symbol Description
Table 49. AC Parameters for a Fix Clock
88
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWH
WHQX
QVWX
WHLH
RLRH
RLDV
RHDX
RHDZ
AVDV
AVWL
LLDV
LLWL
RLAZ
T89C51RD2
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WHLH
RHDX
RHDZ
AVWL
RLRH
RLDV
AVDV
LLWL
RLAZ
LLDV
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
Min
130
130
160
50
75
10
15
10
0
-M
Max
100
160
165
100
30
40
0
Min
130
130
160
50
75
10
15
10
0
-L
Max
100
160
165
100
30
40
0
Units
4243G–8051–05/03
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns