at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 119

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

25.3.3
25.3.4
4235J–8051–01/08
External Program Memory Read Cycle
External Data Memory Characteristics
PORT 0
PORT 2
PSEN
ALE
INSTR IN
OR SFR-P2
ADDRESS
Table 25-3.
T
Symbol
LHLL
T
T
T
T
T
T
T
T
T
T
T
T
T
PLPH
PLAZ
LHLL
AVLL
LLAX
LLPL
LLAX
PLIV
PXIX
PXIZ
AVIV
LLIV
AC Parameters for a Variable Clock
AVLL
A0-A7
T
AVIV
ADDRESS A8-A15
T
Type
LLIV
T
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
LLPL
TPLAZ
T
PLIV
T
PLPH
Standard Clock
INSTR IN
T
PXIX
2 T - x
4 T - x
3 T - x
3 T - x
5 T - x
T - x
T - x
T - x
T - x
12 T
x
x
CLCL
T
PXIZ
T
PXAV
X2 Clock
A0-A7
0.5 T - x
0.5 T - x
0.5 T - x
1.5 T - x
1.5 T - x
0.5 T - x
2.5 T - x
2 T - x
T - x
x
x
AT89C51RD2/ED2
ADDRESS A8-A15
X parameter for
-M range
INSTR IN
15
20
20
35
15
25
45
15
45
10
0
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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