at89s52-33sc ATMEL Corporation, at89s52-33sc Datasheet - Page 32

• Manufacturer Part Number: at89s52-33sc
• Description: At89s52 , 8-bit Microcontroller With 8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

31. External Data Memory Write Cycle
32. External Clock Drive Waveforms
33. External Clock Drive
32
Symbol
1/t
t
t
t
t
t
CLCL
CHCX
CLCX
CLCH
CHCL
CLCL
AT89S52
0.45V
PORT 0
PORT 2
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
V
PSEN
CC
ALE
WR
- 0.5V
0.2 V
0.7 V
A0 - A7 FROM RI OR DPL
CC
t
LHLL
t
- 0.1V
AVLL
CC
t
CHCX
P2.0 - P2.7 OR A8 - A15 FROM DPH
t
AVWL
t
LLAX
t
QVWX
t
LLWL
Min
t
DATA OUT
30
12
12
CLCX
t
0
t
QVWH
t
WLWH
CLCH
t
CLCL
t
WHQX
t
A0 - A7 FROM PCL
WHLH
A8 - A15 FROM PCH
t
CHCX
Max
33
5
5
INSTR IN
t
CHCL
1919C–MICRO–3/05
Units
MHz
ns
ns
ns
ns
ns