Rainbow-electronics T89C51RD2 Manuel d'utilisateur télécharger pdf (Page 9)

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 85 86

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Rainbow-electronics T89C51RD2 Manuel d'utilisateur Page 9

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