AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 3

• 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

Block Diagram
Figure 1. Block Diagram
7663E–8051–10/08
XTALB1(1)
ALE/
XTALB2
XTALA1
XTALA2
PSEN
PROG
WR
EA
RD
(2)
(2)
CPU
(2) (2)
(2)
Timer 0
Timer 1
EUART
(2)
CORE
C51
(2) (2)
256x8
RAM
INT
Ctrl
(2): Alternate function of Port 3
(3): Alternate function of Port 6
(1): Alternate function of Port 1
IB-bus
Port 0 Port 1
128Kx8
Flash
Parallel I/O Ports &
External Bus
Port 2
8192 x 8
XRAM
Port 3
(1)
Port4
PCA
Port 5
(1)
(1)
Timer2
TWI
(1)
(1) (1) (1)(1)
Keyboard
SPI
(1)
BOOT
4K x8
ROM
Watch
Dog
POR
PFD
Regulator
POR / PFD
AT89C51RE2
EUART_1
(3) (3)
3