at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 3

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

Block Diagram
Figure 1. Block Diagram
7663B–8051–03/07
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
(1)
(1) (1) (1)(1)
Keyboard
SPI
(1)
BOOT
4K x8
ROM
Watch
Dog
POR
PFD
Regulator
POR / PFD
EUART_1
(3) (3)
3