AT89C55WD-24JI Atmel, AT89C55WD-24JI Datasheet - Page 29

• Manufacturer Part Number: AT89C55WD-24JI
• Description: IC MICRO CTRL 24MHZ 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C55WD-24JI

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 20KB (20K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -
• Other names: AT89C55WD24JI

31. External Data Memory Write Cycle
32. External Clock Drive Waveforms
33. External Clock Drive
1921D–MICRO–6/08
Symbol
1/t
t
t
t
t
t
CLCL
CHCX
CLCX
CLCH
CHCL
CLCL
0.45V
V
CC
PORT 0
PORT 2
- 0.5V
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
PSEN
ALE
WR
0.2 V
0.7 V
CC
A0 - A7 FROM RI OR DPL
- 0.1V
CC
t
t
LHLL
CHCX
t
AVLL
P2.0 - P2.7 OR A8 - A15 FROM DPH
t
AVWL
t
LLAX
t
QVWX
t
LLWL
Min
t
DATA OUT
30
12
12
t
CLCX
0
t
QVWH
WLWH
t
CLCH
t
WHQX
t
t
A0 - A7 FROM PCL
CLCL
WHLH
A8 - A15 FROM PCH
Max
33
5
5
t
CHCX
INSTR IN
AT89C55WD
Units
MHz
ns
ns
ns
ns
ns
t
CHCL
29