external program memory characteristics, Table 38, Table 39 – Rainbow Electronics T89C51RD2 User Manual
Page 76: Table 38. symbol description, Table 39. ac parameters for a fix clock
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Rev. F - 15 February, 2001
76
T89C51RD2
9.5.2. External Program Memory Characteristics
Table 38. Symbol Description
Symbol
Parameter
T
Oscillator clock period
T
LHLL
ALE pulse width
T
AVLL
Address Valid to ALE
T
LLAX
Address Hold After ALE
T
LLIV
ALE to Valid Instruction In
T
LLPL
ALE to PSEN
T
PLPH
PSEN Pulse Width
T
PLIV
PSEN to Valid Instruction In
T
PXIX
Input Instruction Hold After PSEN
T
PXIZ
Input Instruction FloatAfter PSEN
T
AVIV
Address to Valid Instruction In
T
PLAZ
PSEN Low to Address Float
Table 39. AC Parameters for a Fix Clock
Symbol
-M
-L
Units
Min
Max
Min
Max
T
25
25
ns
T
LHLL
40
40
ns
T
AVLL
10
10
ns
T
LLAX
10
10
ns
T
LLIV
70
70
ns
T
LLPL
15
15
ns
T
PLPH
55
55
ns
T
PLIV
35
35
ns
T
PXIX
0
0
ns
T
PXIZ
18
18
ns
T
AVIV
85
85
ns
T
PLAZ
10
10
ns
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