AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 177

• 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

Flash Memory
7663E–8051–10/08
Table 128. Timing Symbol Definitions
Table 129. Memory AC Timing
VDD = 3V to 5.5V, TA = -40 to +85°C
Figure 76. Flash Memory – ISP Waveforms
Figure 77. Flash Memory – Internal Busy Waveforms
S (Hardware
condition)
R
B
Symbol
T
T
T
N
T
SVRL
RLSX
BHBL
FDR
FCY
PSEN#1
FBUSY bit
Signals
RST
Parameter
Input PSEN# Valid to RST Edge
Input PSEN# Hold after RST Edge
Flash Internal Busy (Programming) Time
Number of Flash Erase/Write Cycles
Flash Retention Time
PSEN#,EA
RST
FBUSY flag
T
SVRL
T
BHBL
T
RLSX
L
V
X
100 000
Min
50
50
10
Typ
10
AT89C51RE2
Conditions
Low
Valid
No Longer Valid
Max
cycles
years
Unit
ms
ns
ns
177