T89C51RD2-3CSCL ATMEL [ATMEL Corporation], T89C51RD2-3CSCL Datasheet - Page 3

• Manufacturer Part Number: T89C51RD2-3CSCL
• Description: 0 to 40 MHz Flash Programmable 8-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

Block Diagram
Notes:
4243G–8051–05/03
1. Alternate function of Port 1.
2. Only available on high pin count packages.
3. Alternate function of Port 3.
ALE/
XTAL1
XTAL2
PSEN
PROG
WR
EA
RD
(3)
(3)
CPU
(3) (3)
(3)
Timer 0
Timer 1
EUART
(3)
CORE
C51
(3) (3)
256x8
RAM
INT
Ctrl
IB-bus
Port 0Port 1 Port 2 Port 3
Flash
64Kx8
Parallel I/O Ports & Ext. Bus
XRAM
1Kx8
EEPROM
Port 4
(2)
2Kx8
Port 5
(2)
(1)
PCA
Watch
Dog
(1)
(1)
Timer2
(1)
T89C51RD2
3