AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 169

• 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 Program
Memory
Characteristics
7663E–8051–10/08
Example: T
x = 35 ns
T 50 ns
T
Table 119. Symbol Description
Table 120. AC Parameters for a Fix Clock
Notes:
CCIV
Symbol
= 4T - x = 165 ns
T
T
T
T
T
T
T
T
T
T
T
AVLL
LLAX
PLPH
PLAZ
LHLL
LLPL
PXIX
PXIZ
AVIV
LLIV
PLIV
T
1. ‘ -L ‘ refers to 2V - 5.5V version.
2. ‘ -M ’ refers to 4.5V to 5.5V version.
Symbol
T
T
T
T
T
T
T
T
T
T
T
LLIU
PLPH
LHLL
AVLL
LLAX
LLPL
PLAZ
PLIV
PXIX
PXIZ
AVIV
LLIV
T
for -M and 20 MHz, Standard clock.
Min
25
35
50
5
5
5
0
Parameter
Oscillator clock period
ALE pulse width
Address Valid to ALE
Address Hold After ALE
ALE to Valid Instruction In
ALE to PSEN
PSEN Pulse Width
PSEN to Valid Instruction In
Input Instruction Hold After PSEN
Input Instruction Float After PSEN
Address to Valid Instruction In
PSEN Low to Address Float
-M
(1)
Max
n 65
30
10
80
10
Min
25
35
50
5
5
5
0
-L
(2)
Max
AT89C51RE2
65
30
10
80
10
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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