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T89C51RD2-3CFC-M Datasheet(PDF) 9 Page - ATMEL Corporation |
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T89C51RD2-3CFC-M Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 86 page 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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