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AT89S52-24AC Datasheet(Scheda tecnica) 32 Page - ATMEL Corporation

Numero della parte AT89S52-24AC
Dettagli  8-bit Microcontroller with 8K Bytes In-System Programmable Flash
Download  39 Pages
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Produttore  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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 32 page
background image
32
1919C–MICRO–3/05
AT89S52
31. External Data Memory Write Cycle
32. 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
33. External Clock Drive
Symbol
Parameter
Min
Max
Units
1/tCLCL
Oscillator Frequency
0
33
MHz
t
CLCL
Clock Period
30
ns
t
CHCX
High Time
12
ns
tCLCX
Low Time
12
ns
t
CLCH
Rise Time
5
ns
t
CHCL
Fall Time
5
ns




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