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Major Chips Description 2-45
2.5.3 Pin Diagram
9 P4.2/CMSR2
8 P4.1/CMSR1
7 P4.0/CMSR0
6 EW#
5 PWM1#
4 PWM0#
3 STADC
2 VDD
1 P5.0/ADC0
68 P5.1/ADC1
67 P5.2/ADC2
66 P5.3/ADC3
65 P5.4/ADC4
64 P5.5/ADC5
63 P5.6/ADC6
62 P5.7/ADC7
61 AVDD
60 AVSS
59 AVref+
58 AVref–
57 P0.0/AD0
56 P0.1/AD1
55 P0.2/AD2
54 P0.3/AD3
53 P0.4/AD4
52 P0.5/AD5
51 P0.6/AD6
50 P0.7/AD7
49 EA#/VPP
48 ALE/PROG#
47 PSEN#
46 P2.7/A15
45 P2.6/A14
44 P2.5/A13
43 P2.4/A12
42 P2.3/A11
41 P2.2/A10
40 P2.1/A09
39 P2.0/A08
38 NC
37 VSS
36 VSS
35 XTAL1
34 XTAL2
33 NC
32 NC
31 P3.7/RD
30 P3.6/WR
29 P3.5/T1
28 P3.4/T0
27 P3.3/INT1
P4.3/CMSR3 10
P4.4/CMSR4 11
P4.5/CMSR5 12
P4.6/CMT0 13
P4.7/CMT1 14
RST 15
P1.0/CT0I 16
P1.1/CT1I 17
P1.2/CT2I 18
P1.3/CT3I 19
P1.4/T2 20
P1.5/RT2 21
P1.6/SCL 22
P1.7/SDA 23
P3.0/RxD 24
P3.1/TxD 25
P3.2/INT0 26
Figure 2-7 87C552 Pin Diagram