AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 9

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

4. Pin Configurations
Figure 4-1.
4235K–8051–05/08
Pin Configurations
P1.5/CEX2/MISO
P1.7/CEx4/MOSI
P1.6/CEX3/SCK
P1.6/CEX3/SCK
P1.7/CEX4/MOSI
P1.5/CEX2/MISO
P3.2/INT0
P3.3/INT1
P3.0/RxD
P3.1/TxD
P3.4/T0
P3.5/T1
P3.2/INT0
P3.3/INT1
P3.0/RxD
P3.1/TxD
P3.4/T0
P3.5/T1
RST
NIC*
RST
NIC*
14
10
12
13
15
16
17
7
8
9
11
18 19
1
3
4
5
10
2
6
7
8
9
11
6
44
5 4 3 2 1
12 13
AT89C51RD2/ED2
20
43 42 41 40 39
AT89C51RD2/ED2
21
14
PLCC44
22
15
VQFP44 1.4
23
16
24
17
44 43 42 41 40
25
38 37 36 35 34
18
19
26
20
27 28
21 22
36
34
33
32
39
38
37
35
31
30
29
26
32
30
28
27
25
24
23
33
31
29
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
ALE/PROG
PSEN
P2.7/A15
P2.6/A14
P2.5/A13
NIC*
P2.6/A14
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
ALE/PROG
PSEN
P2.7/A15
P2.5/A13
NIC*
AT89C51RD2/ED2
9