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T89C51RD2-3CWC-M Datasheet(PDF) 9 Page - ATMEL Corporation

No. de pieza T89C51RD2-3CWC-M
Descripción Electrónicos  0 to 40MHz Flash Programmable 8-bit Microcontroller
PDF  86 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51RD2-3CWC-M Datasheet(HTML) 9 Page - ATMEL Corporation

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Rev. F - 15 February, 2001
9
T89C51RD2
5.1. Pin Description for 64/68 pin Packages
Port 4 and Port 5 are 8-bit bidirectional I/O ports with internal pull-ups. Pins that have 1 written to them are pulled
high by the internal pull ups and can be used as inputs.
As inputs, pins that are externally pulled low will source current because of the internal pull-ups.
Refer to the previous pin description for other pins.
PLCC68
SQUARE
VQFP64 1.4
VSS
51, 18
9/40
VCC
17
8
P0.0
15
6
P0.1
14
5
P0.2
12
3
P0.3
11
2
P0.4
9
64
P0.5
6
61
P0.6
5
60
P0.7
3
59
P1.0
19
10
P1.1
21
12
P1.2
22
13
P1.3
23
14
P1.4
25
16
P1.5
27
18
P1.6
28
19
P1.7
29
20
P2.0
54
43
P2.1
55
44
P2.2
56
45
P2.3
58
47
P2.4
59
48
P2.5
61
50
P2.6
64
53
P2.7
65
54
P3.0
34
25
P3.1
39
28
P3.2
40
29
P3.3
41
30
P3.4
42
31
P3.5
43
32
P3.6
45
34
P3.7
47
36
RESET
30
21
ALE/PROG
68
56
PSEN
67
55
EA
2
58
XTAL1
49
38
XTAL2
48
37
P4.0
20
11
P4.1
24
15
P4.2
26
17
P4.3
44
33
P4.4
46
35
P4.5
50
39
P4.6
53
42
P4.7
57
46
P5.0
60
49
P5.1
62
51
P5.2
63
52
P5.3
7
62
P5.4
8
63
P5.5
10
1
P5.6
13
4
P5.7
16
7



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