AT89C51RB2/RC2
Pin Configurations
Figure 2.
Pin Configurations
P0.2/AD2
P0.3/AD3
39
38
37
36
35
34
33
32
31
30
29
P0.0/AD0
P0.1/AD1
P1.2/ECI
P1.0/T2
P1.1/T2EX/SS
P1.2/ECI
P1.3CEX0
P1.4/CEX1
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7CEX4/MOSI
RST
P3.0/RxD
P3.1/TxD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
P3.6/WR
P3.7/RD
XTAL2
XTAL1
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VCC
P0.0/AD0
P0.1/AD1
P0.2/AD2
P0.3/AD3
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
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7/CEx4/MOSI
RST
P3.0/RxD
NIC*
P3.1/TxD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
7
8
9
10
11
12
13
14
15
16
17
P1.1/T2EX/SS
P1.4/CEX1
P1.3/CEX0
P1.0/T2
NIC*
6 5 4 3 2 1 44 43 42 41 40
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
PDIL40
PLCC44
18 19 20 21 22 23 24 25 26 27 28
P3.6/WR
P2.2/A10
P2.3/A11
P2.4/A12
P3.7/RD
NIC*
P2.0/A8
P2.1/A9
XTAL2
XTAL1
VSS
P1.1/T2EX/SS
P1.4/CEX1
P1.3/CEX0
P0.0/AD0
P0.1/AD1
P0.2/AD2
44 43 42 41 40 39 38 37 36 35 34
P1.5/CEX2/MISO
P1.6/CEX3/SCK
P1.7/CEX4/MOSI
RST
P3.0/RxD
NIC*
P3.1/TxD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
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
VQFP44 1.4
12 13 14 15 16 17 18 19 20 21 22
P3.6/WR
P2.2/A10
P2.3/A11
XTAL1
P2.0/A8
P3.7/RD
P2.1/A9
XTAL2
P2.4/A12
NIC*
VSS
*NIC: No Internal Connection
P0.3/AD3
P1.2/ECI
P1.0/T2
NIC*
VCC
VCC
9
4180C–8051–12/03
ATMEL [ ATMEL CORPORATION ]
