AT89C51RB2/RC2
Pin Configurations
Figure 2. Pin Configurations
P1.0/T2
40
39
38
1
2
VCC
P0.0/AD0
P0.1/AD1
P1.1/T2EX/SS
P1.2/ECI
P1.3CEX0
P1.4/CEX1
3
4
37 P0.2/AD2
6
5 4 3 2 1 44 43 42 41 40
P0.3/AD3
P0.4/AD4
36
35
34
33
32
31
30
5
6
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7/CEx4/MOSI
RST
39
38
7
8
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7CEX4/MOSI
RST
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
P0.5/AD5
P0.6/AD6
P0.7/AD7
7
8
37
9
10
36
35
34
33
9
P3.0/RxD
NIC*
11
12
13
EA
P3.0/RxD 10
PDIL40
ALE/PROG
PSEN
P3.1/TxD
11
12
13
PLCC44
NIC*
P3.1/TxD
P3.2/INT0
P3.3/INT1
29
28
ALE/PROG
PSEN
P3.2/INT0
P3.3/INT1
P3.4/T0
P2.7/AD15
P2.6/AD14
14
15
16
17
32
31
30
29
P3.4/T0 14
27
26
P2.7/A15
P2.6/A14
P2.5/A13
P2.5/AD13
15
16
P3.5/T1
P2.4/AD12
P2.3/AD11
P3.5/T1
25
P3.6/WR
18 19 20 21 22 23 24 25 26 27 28
17
18
19
20
24
23
22
21
P3.7/RD
XTAL2
P2.2/AD10
P2.1/AD9
P2.0/AD8
XTAL1
VSS
44 43 42 41 40 39
38 37 36 35 34
P0.4/AD4
P0.5/AD5
P0.6/AD6
P0.7/AD7
EA
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7/CEX4/MOSI
RST
33
32
1
2
31
30
29
28
27
3
4
P3.0/RxD
NIC*
5
6
7
8
VQFP44 1.4
NIC*
P3.1/TxD
ALE/PROG
PSEN
26
25
24
P3.2/INT0
P3.3/INT1
P3.4/T0
P2.7/A15
P2.6/A14
P2.5/A13
9
10
11
23
P3.5/T1
12 13 141516 17 18 19202122
*NIC: No Internal Connection
9
4180C–8051–12/03
ATMEL [ ATMEL ]
