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AT89C55WD Fiches technique(PDF) 19 Page - ATMEL Corporation

No de pièce AT89C55WD
Description  8-bit Microcontroller with 20K Bytes Flash
PDF  35 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C55WD Fiches technique(HTML) 19 Page - ATMEL Corporation

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1921C–MICRO–3/05
AT89C55WD
Figure 18-1. Oscillator Connections
Note:
C1, C2 = 30 pF ± 10 pF for Crystals
= 40 pF ± 10 pF for Ceramic Resonators
Figure 18-2. External Clock Drive Configuration
Table 18-1.
Status of External Pins During Idle and Power-down Modes
Mode
Program
Memory
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
1
Data
Data
Data
Data
Idle
External
1
1
Float
Data
Address
Data
Power-down
Internal
0
0
Data
Data
Data
Data
Power-down
External
0
0
Float
Data
Data
Data
C2
XTAL2
GND
XTAL1
C1
XTAL2
XTAL1
GND
NC
EXTERNAL
OSCILLATOR
SIGNAL



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