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AT89LS51 Datasheet(PDF) 25 Page - ATMEL Corporation

Part # AT89LS51
Description  8-bit Low-Voltage Microcontroller with 4K Bytes In-System Programmable Flash
PDF  32 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89LS51 Datasheet(HTML) 25 Page - ATMEL Corporation

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25
3053B–MICRO–3/05
AT89LS51
26. External Data Memory Write Cycle
27. External Clock Drive Waveforms
t
LHLL
t
LLWL
t
LLAX
t
WHLH
t
AVLL
t
WLWH
t
AVWL
t
QVWX
t
QVWH
t
WHQX
A0 - A7 FROM RI OR DPL
ALE
PSEN
WR
PORT 0
PORT 2
P2.0 - P2.7 OR A8 - A15 FROM DPH
A0 - A7 FROM PCL
A8 - A15 FROM PCH
DATA OUT
INSTR IN
t
CHCX
t
CHCX
t
CLCX
t
CLCL
t
CHCL
t
CLCH
V
- 0.5V
CC
0.45V
0.2 V
- 0.1V
CC
0.7 V
CC
28. External Clock Drive
Symbol
Parameter
Min
Max
Units
1/tCLCL
Oscillator Frequency
0
16
MHz
t
CLCL
Clock Period
62.5
ns
t
CHCX
High Time
20
ns
tCLCX
Low Time
20
ns
t
CLCH
Rise Time
20
ns
t
CHCL
Fall Time
20
ns



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