AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 120

• 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

120
AT89C51RE2
Table 88. Pin Conditions in Special Operating Modes
Idle (external
Power-Down
Power-Down
Idle (internal
(external
(internal
Mode
Reset
code)
code)
code)
code)
Floating
Floating
Floating
Port 0
Data
Data
Port 1
High
Data
Data
Data
Data
Port 2
Data
Data
Data
Data
High
Port 3
High
Data
Data
Data
Data
Port 4
High
Data
Data
Data
Data
ALE
High
High
High
Low
Low
7663E–8051–10/08
PSEN#
High
High
High
Low
Low