at87f52-20qi ATMEL Corporation, at87f52-20qi Datasheet - Page 19

• Manufacturer Part Number: at87f52-20qi
• Description: At87f52 8-bit Microcontroller With 8k Bytes Quickflash
• Manufacturer: ATMEL Corporation

External Data Memory Write Cycle
External Clock Drive Waveforms
External Clock Drive
Symbol
1/t
t
t
t
t
t
CLCL
CHCX
CLCX
CLCH
CHCL
CLCL
0.45V
PORT 0
PORT 2
PSEN
V
ALE
CC
WR
- 0.5V
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
0.2 V
A0 - A7 FROM RI OR DPL
0.7 V
t
CC
LHLL
t
AVLL
- 0.1V
CC
t
P2.0 - P2.7 OR A8 - A15 FROM DPH
CHCX
t
AVWL
t
LLAX
t
QVWX
t
LLWL
DATA OUT
t
QVWH
t
t
WLWH
CLCX
t
CLCH
41.6
Min
15
15
0
t
t
WHQX
CLCL
t
A0 - A7 FROM PCL
WHLH
A8 - A15 FROM PCH
t
CHCX
Max
24
20
20
INSTR IN
t
CHCL
Units
MHz
ns
ns
ns
ns
ns
19