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Part Name
Description
AT89C51RD2 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
AT89C51RD2
8-bit Flash Microcontroller
Atmel Corporation
AT89C51RD2 Datasheet PDF : 137 Pages
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2. Block Diagram
Figure 2-1.
Block Diagram
AT89C51RD2/ED2
(2) (2)
(1) (1) (1) (1)
(1)
XTALA1
XTALA2
ALE/ PROG
PSEN
EA
RD
(2)
WR
(2)
EUART
RAM
256x8
Flash
64K x 8
CPU
C51
CORE
IB-bus
XRAM
1792 x 8
PCA
Timer2 Keyboard
Watch
-dog
EEPROM*
2K x 8
(AT89C51ED2)
Timer 0 INT
Timer 1 Ctrl
Parallel I/O Ports &
External Bus
Port 0 Port 1
Port 2
Port 3 Port4 Port 5
BOOT Regulator
SPI
2K x 8
POR / PFD
ROM
(2) (2) (2) (2)
(1) (1)(1)(1)
(1): Alternate function of Port 1
(2): Alternate function of Port 3
3
4235K–8051–05/08
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