Owner manual
2 Rev. F - 15 February, 2001
T89C51RD2
• Power supply:
- M version: Commercial and industrial
4.5V to 5.5V : 40MHz X1 Mode, 20MHz X2 Mode
3V to 5.5V : 33MHz X1 Mode, 16 MHz X2 Mode
- L version: Commercial and industrial
2.7V to 3.6V : 25MHz X1 Mode, 12MHz X2 Mode
• Temperature ranges: Commercial (0 to +70°C) and industrial (-40 to +85°C).
• Packages: PDIL40, PLCC44, VQFP44, PLCC68, VQFP64
Table 1. Memory Size
3. Block Diagram
PDIL40
PLCC44
VQFP44 1.4
Flash (bytes) EEPROM (bytes) XRAM (bytes)
TOTAL RAM
(bytes)
I/O
T89C51RD2 64k 2k 1024 1280 32
PLCC68
VQFP64 1.4
Flash (bytes)
EEPROM
(bytes)
XRAM (bytes)
TOTAL RAM
(bytes)
I/O
T89C51RD2 64k 2k 1024 1280 48
Timer 0
INT
RAM
256x8
T0
T1
RxD
TxD
WR
RD
EA
PSEN
ALE/
XTAL2
XTAL1
EUART
CPU
Timer 1
INT1
Ctrl
INT0
(3)
(3)
C51
CORE
(3) (3) (3) (3)
Port 0
P0
Port 1
Port 2
Port 3
Parallel I/O Ports & Ext. Bus
P1
P2
P3
XRAM
1Kx8
IB-bus
PCA
RESET
PROG
Watch
Dog
PCA
ECI
Vss
V
CC
(3)(3)
(1)
(1): Alternate function of Port 1
(3): Alternate function of Port 3
(1)
Timer2
T2EX
T2
(1) (1)
Port 5Port 4
P5
P4
(2): Only available on high pin count packages
(2)(2)
Flash
64Kx8
EEPROM
2Kx8