AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 132

• 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

Figure 50. Block Diagram
132
AT89C51RE2
PI2.1
PI2.0
SDA
SCL
Input
Filter
Output
Stage
Input
Filter
Output
Stage
Timer 1
overflow
Status
Bits
SSADR
SSCON
SSDAT
SSCS
Arbitration &
Sink Logic
Serial clock
generator
Address Register
Status Register
Comparator
Control Register
Shift Register
Status
Decoder
Timing &
Control
logic
8
8
8
7
ACK
F
CLK PERIPH
Interrupt
/4
7663D–8051–10/08