AT89C55WD Atmel Corporation, AT89C55WD Datasheet - Page 19
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AT89C55WD
Manufacturer Part Number
AT89C55WD
Description
Manufacturer
Atmel Corporation
Datasheet
1.AT89C55WD.pdf
(35 pages)
Specifications of AT89C55WD
Flash (kbytes)
20 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
32
Uart
1
Sram (kbytes)
0.25
Operating Voltage (vcc)
4.0 to 6.0
Timers
3
Watchdog
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT89C55WD
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89C55WD-24AC
Manufacturer:
ATMEL
Quantity:
508
Company:
Part Number:
AT89C55WD-24AU
Manufacturer:
REALTEK
Quantity:
300
Company:
Part Number:
AT89C55WD-24AU
Manufacturer:
ATMEL
Quantity:
27 947
Part Number:
AT89C55WD-24AU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
Company:
Part Number:
AT89C55WD-24JC
Manufacturer:
ATM
Quantity:
2 340
Company:
Part Number:
AT89C55WD-24JC
Manufacturer:
ATM
Quantity:
2 340
Part Number:
AT89C55WD-24JC
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
1921D–MICRO–6/08
Figure 18-1. Oscillator Connections
Note:
Figure 18-2. External Clock Drive Configuration
Table 18-1.
Mode
Idle
Idle
Power-down
Power-down
C1, C2 = 30 pF ± 10 pF for Crystals
Status of External Pins During Idle and Power-down Modes
= 40 pF ± 10 pF for Ceramic Resonators
Program
Memory
Internal
External
Internal
External
OSCILLATOR
EXTERNAL
SIGNAL
ALE
1
1
0
0
NC
C2
C1
PSEN
1
1
0
0
PORT0
Float
Float
Data
Data
XTAL2
XTAL1
GND
XTAL2
XTAL1
GND
PORT1
Data
Data
Data
Data
AT89C55WD
Address
PORT2
Data
Data
Data
PORT3
Data
Data
Data
Data
19