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AT89S52 Datasheet(PDF) 30 Page - ATMEL Corporation

Part # AT89S52
Description  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89S52 Datasheet(HTML) 30 Page - ATMEL Corporation

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1919D–MICRO–6/08
AT89S52
28. AC Characteristics
Under operating conditions, load capacitance for Port 0, ALE/PROG, and PSEN = 100 pF; load capacitance for all other
outputs = 80 pF.
28.1
External Program and Data Memory Characteristics
Symbol
Parameter
12 MHz Oscillator
Variable Oscillator
Units
Min
Max
Min
Max
1/tCLCL
Oscillator Frequency
0
33
MHz
t
LHLL
ALE Pulse Width
127
2t
CLCL-40
ns
tAVLL
Address Valid to ALE Low
43
tCLCL-25
ns
tLLAX
Address Hold After ALE Low
48
tCLCL-25
ns
t
LLIV
ALE Low to Valid Instruction In
233
4t
CLCL-65
ns
tLLPL
ALE Low to PSEN Low
43
tCLCL-25
ns
tPLPH
PSEN Pulse Width
205
3tCLCL-45
ns
t
PLIV
PSEN Low to Valid Instruction In
145
3t
CLCL-60
ns
tPXIX
Input Instruction Hold After PSEN
00
ns
tPXIZ
Input Instruction Float After PSEN
59
tCLCL-25
ns
t
PXAV
PSEN to Address Valid
75
t
CLCL-8
ns
tAVIV
Address to Valid Instruction In
312
5tCLCL-80
ns
tPLAZ
PSEN Low to Address Float
10
10
ns
t
RLRH
RD Pulse Width
400
6t
CLCL-100
ns
tWLWH
WR Pulse Width
400
6tCLCL-100
ns
t
RLDV
RD Low to Valid Data In
252
5t
CLCL-90
ns
t
RHDX
Data Hold After RD
00
ns
tRHDZ
Data Float After RD
97
2tCLCL-28
ns
t
LLDV
ALE Low to Valid Data In
517
8t
CLCL-150
ns
t
AVDV
Address to Valid Data In
585
9t
CLCL-165
ns
tLLWL
ALE Low to RD or WR Low
200
300
3tCLCL-50
3tCLCL+50
ns
t
AVWL
Address to RD or WR Low
203
4t
CLCL-75
ns
t
QVWX
Data Valid to WR Transition
23
t
CLCL-30
ns
tQVWH
Data Valid to WR High
433
7tCLCL-130
ns
t
WHQX
Data Hold After WR
33
t
CLCL-25
ns
t
RLAZ
RD Low to Address Float
0
0
ns
tWHLH
RD or WR High to ALE High
43
123
tCLCL-25
tCLCL+25
ns


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