T89C51RD2-3CBC-L ATMEL [ATMEL Corporation], T89C51RD2-3CBC-L Datasheet - Page 5

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

5. Pin Configuration
Rev. F - 15 February, 2001
P1.4/CEX1
P1.5/CEX2
P1.6/CEX3
P1.1/T2EX
P1.3CEX0
P1.7CEX4
P3.2/INT0
P3.3/INT1
*NIC: No Internal Connection
P3.0/RxD
P3.1/TxD
P1.2/ECI
P3.6/WR
P3.7/RD
P1.0/T2
P3.4/T0
P3.5/T1
XTAL2
XTAL1
RST
VSS
14
4
10
12
13
1
3
5
6
7
8
11
15
16
17
2
9
18
19
20
PDIL
P1.6/CEX3
P1.5/CEX2
P1.7/CEX4
P3.2/INT0
P3.3/INT1
P3.0/RxD
P3.1/TxD
P3.4/T0
P3.5/T1
RST
NIC*
33
26
25
24
40
39
36
34
30
29
23
22
21
38
37
35
32
31
28
27
3
4
5
10
1
2
6
7
8
9
11
P0.0/AD0
P0.1/AD1
P0.2/AD2
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
ALE/PROG
PSEN
P2.7/AD15
P2.6/AD14
P2.5/AD13
P2.4/AD12
P2.3/AD11
P2.2/AD10
P2.1/AD9
P2.0/AD8
P0.3/AD3
VCC
44
12 13
43 42 41 40 39
14
15
VQFP44 1.4
16
17
38 37 36 35 34
18
19
P1.5/CEX2
P1.6/CEX3
P1.7/CEx4
P3.2/INT0
P3.3/INT1
P3.0/RxD
P3.1/TxD
20
P3.4/T0
P3.5/T1
21 22
NIC*
RST
26
33
32
31
30
29
28
27
25
24
23
14
10
12
13
8
11
15
16
17
7
9
18 19
6
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
NIC*
ALE/PROG
PSEN
P2.7/A15
P2.6/A14
P2.5/A13
5 4 3 2 1
20
21
22
PLCC
23
24
44 43 42 41 40
T89C51RD2
25
26
27 28
32
38
36
34
33
31
30
29
39
37
35
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
NIC*
ALE/PROG
PSEN
P2.7/A15
P2.6/A14
P2.5/A13
5