AT89C51AC3_08 Datasheet, PDF (3/140 Pages) ATMEL Corporation – Enhanced 8-bit Microcontroller with 64KB Flash Memory

Pin Configuration
AT89C51AC3
P1.4/AN4/CEX1 7
P1.5/AN5/CEX2 8
P1.6/AN6/CEX3 9
P1.7/AN7/CEX4 10
EA 11
P3.0/RxD 12
P3.1/TxD 13
P3.2/INT0 14
P3.3/INT1 15
P3.4/T0 16
P3.5/T1 17
PLCC44
39 ALE
38 PSEN
37 P0.7/AD7
36 P0.6/AD6
35 P0.5/AD5
34 P0.4/AD4
33 P0.3/AD3
32 P0.2/AD2
31 P0.1/AD1
30 P0.0/AD0
29 P2.0/A8
4383D–8051–02/08
P1.4/AN4/CEX1
P1.5/AN5/CEX2
P1.6/AN6/CEX3
P1.7/AN7/CEX4
EA
P3.0/RxD
P3.1/TxD
P3.2/INT0
P3.3/INT1
P3.4/T0
P3.5/T1
44 43 42 41 40 39 38 37 36 35 34
1
33
2
32
3
31
4
30
5
29
6
VQFP44
28
7
27
8
26
9
25
10
24
11
23
12 13 14 15 16 17 18 19 20 21 22
ALE
PSEN
P0.7/AD7
P0.6/AD6
P0.5/AD5
P0.4 /AD4
P0.3 /AD3
P0.2 /AD2
P0.1 /AD1
P0.0 /AD0
P2.0/A8
3