AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 173

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

External Data Memory
Write Cycle
7663E–8051–10/08
PORT 0
PORT 2
PSEN
ALE
WR
OR SFR-P2
ADDRESS
Table 124. AC Parameters for a Variable Clock
Notes:
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
RHDX
AVWL
WHLH
WHLH
RLRH
RLDV
RHDZ
AVDV
LLDV
LLWL
LLWL
RLAZ
1. ‘ -L ‘ refers to 2V - 5.5V version.
2. ‘ -M ’ refers to 4.5V to 5.5V version.
Type
Max
Max
Max
Max
Max
Max
Max
Min
Min
Min
Min
Min
Min
Min
Min
Min
A0-A7
Standard
T
Clock
T
3 T + x
6 T - x
6 T - x
5 T - x
2 T - x
8 T - x
9 T - x
3 T - x
4 T - x
7 T - x
LLAX
T + x
T - x
T - x
T - x
AVWL
x
x
T
LLWL
X2 Clock
1.5 T + x
0.5 T + x
2.5 T - x
4.5 T - x
1.5 T - x
0.5 T - x
3.5 T - x
0.5 T - x
0.5 T - x
ADDRESS A8-A15 OR SFR P2
3 T - x
3 T - x
2 T - x
4T -x
T - x
x
x
T
QVWX
X parameter for
T
-M
QVWH
T
(1)
DATA OUT
WLWH
25
25
30
25
45
65
30
30
30
20
20
15
20
20
range
0
0
T
X parameter for
WHLH
-L
(2)
AT89C51RE2
25
25
30
25
45
65
30
30
30
20
20
15
20
20
range
0
0
T
WHQX
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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