AT89C51-20PC(2000) Просмотр технического описания (PDF) - Atmel Corporation
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AT89C51-20PC Datasheet PDF : 17 Pages
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AT89C51
External Data Memory Write Cycle
ALE
tLHLL
PSEN
WR
PORT 0
PORT 2
tLLWL
tWLWH
tAVLL
tLLAX
tQVWX
A0 - A7 FROM RI OR DPL
tAVWL
tQVWH
DATA OUT
P2.0 - P2.7 OR A8 - A15 FROM DPH
tWHLH
tWHQX
A0 - A7 FROM PCL INSTR IN
A8 - A15 FROM PCH
External Clock Drive Waveforms
VCC - 0.5V
tCHCX
0.7 VCC
0.45V
0.2 VCC - 0.1V
tCLCH
tCLCX
tCHCX
tCLCL
tCHCL
External Clock Drive
Symbol
1/tCLCL
tCLCL
tCHCX
tCLCX
tCLCH
tCHCL
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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