AT89C51CC01_14 Datasheet, PDF (150/167 Pages) ATMEL Corporation – Boot Code Section with Independent Lock Bits

External Data Memory
Characteristics
Table 126. Symbol Description
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
Table 127. AC Parameters for a Variable Clock (F=40MHz)
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
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
150 A/T89C51CC01
4129N–CAN–03/08