External Clock Drive
Symbol
Parameter
Min
Max
Units
1/t
CLCL
Oscillator Frequency
0
24
MHz
t
CLCL
Clock Period
41.6
ns
t
CHCX
High Time
15
ns
t
CLCX
Low Time
15
ns
t
CLCH
Rise Time
20
ns
t
CHCL
Fall Time
20
ns
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
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
External Data Memory Cycle
AT89C52
19
