at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 155

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

138
AT89C51RE2
Table 102. AC Parameters for a Fix Clock
Table 103. AC Parameters for a Variable Clock
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Symbol
WLWH
QVWH
WHQX
QVWX
WHLH
WHLH
RLRH
RLDV
RHDX
RHDZ
AVDV
AVWL
LLDV
LLWL
LLWL
RLAZ
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WHLH
RLRH
RHDX
RHDZ
AVDV
AVWL
RLDV
LLDV
LLWL
RLAZ
Type
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
Standard
Clock
3 T + x
6 T - x
6 T - x
5 T - x
2 T - x
8 T - x
9 T - x
3 T - x
4 T - x
7 T - x
T + x
T - x
T - x
T - x
x
x
Min
125
125
155
45
70
10
0
5
0
5
X2 Clock
-M
1.5 T + x
0.5 T + x
2.5 T - x
4.5 T - x
1.5 T - x
0.5 T - x
3.5 T - x
0.5 T - x
0.5 T - x
3 T - x
3 T - x
2 T - x
4T -x
T - x
x
x
Max
X parameter for
155
160
105
95
25
45
-M range
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
Min
125
125
155
45
70
10
0
5
0
5
X parameter for
-L range
-L
25
25
30
25
45
65
30
30
30
20
20
15
20
20
0
0
Max
155
160
105
95
25
45
7663B–8051–03/07
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns