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AT89V51 데이터 시트보기 (PDF) - Atmel Corporation
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AT89V51
8-bit Microcontroller with 4K Bytes Flash
Atmel Corporation
AT89V51 Datasheet PDF : 17 Pages
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AT89C51
External Data Memory Write Cycle
ALE
t
LHLL
PSEN
WR
PORT 0
PORT 2
t
LLWL
t
WLWH
t
AVLL
t
LLAX
t
QVWX
A0 - A7 FROM RI OR DPL
t
AVWL
t
QVWH
DATA OUT
P2.0 - P2.7 OR A8 - A15 FROM DPH
t
WHLH
t
WHQX
A0 - A7 FROM PCL INSTR IN
A8 - A15 FROM PCH
External Clock Drive Waveforms
V
CC
- 0.5V
t
CHCX
0.7 V
CC
0.45V
0.2 V
CC
- 0.1V
t
CLCH
t
CLCX
t
CHCX
t
CLCL
t
CHCL
External Clock Drive
Symbol
1/t
CLCL
t
CLCL
t
CHCX
t
CLCX
t
CLCH
t
CHCL
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Min
Max
Units
0
24
MHz
41.6
ns
15
ns
15
ns
20
ns
20
ns
13
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