T89C51RD2-SMSC-M View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'T89C51RD2-SMSC-M' PDF : 86 Pages View PDF
T89C51RD2
9.5.2. External Program Memory Characteristics
Table 38. Symbol Description
Symbol
Parameter
T
Oscillator clock period
TLHLL
ALE pulse width
TAVLL
Address Valid to ALE
TLLAX
Address Hold After ALE
TLLIV
ALE to Valid Instruction In
TLLPL
ALE to PSEN
TPLPH
PSEN Pulse Width
TPLIV
PSEN to Valid Instruction In
TPXIX
Input Instruction Hold After PSEN
TPXIZ
Input Instruction FloatAfter PSEN
TAVIV
Address to Valid Instruction In
TPLAZ
PSEN Low to Address Float
Symbol
T
TLHLL
TAVLL
TLLAX
TLLIV
TLLPL
TPLPH
TPLIV
TPXIX
TPXIZ
TAVIV
TPLAZ
Table 39. AC Parameters for a Fix Clock
-M
-L
Min
Max
Min
Max
25
25
40
40
10
10
10
10
70
70
15
15
55
55
35
35
0
0
18
18
85
85
10
10
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Rev. F - 15 February, 2001
76
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