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AT89x51xxA
8-bit Microcontroller with 4K Bytes Flash, TQFP-44
Schematic Symbol
Pin Configuration (44 pins)
| Pin | Name | Type |
|---|---|---|
| 42 | P1.2 | bidirectional |
| 1 | P1.5 | bidirectional |
| 2 | P1.6 | bidirectional |
| 3 | P1.7/SCK | bidirectional |
| 4 | RST | input |
| 5 | P3.0 | bidirectional |
| 6 | NC | no_connect |
| 7 | P3.1 | bidirectional |
| 8 | P3.2 | bidirectional |
| 9 | P3.3 | bidirectional |
| 10 | P3.4 | bidirectional |
| 11 | P3.5 | bidirectional |
| 12 | P3.6 | bidirectional |
| 13 | P3.7 | bidirectional |
| 14 | XTAL2 | input |
| 15 | XTAL1 | input |
| 16 | GND | power_in |
| 17 | GND | passive |
| 18 | P2.0/A8 | bidirectional |
| 19 | P2.1/A9 | bidirectional |
| 20 | P2.2/A10 | bidirectional |
| 21 | P2.3/A11 | bidirectional |
| 22 | P2.4/A12 | bidirectional |
| 23 | P2.5/A13 | bidirectional |
| 24 | P2.6/A14 | bidirectional |
| 25 | P2.7/A15 | bidirectional |
| 26 | ~{PSEN} | output |
| 27 | ALE | output |
| 28 | NC | no_connect |
| 29 | ~{EA}/V_{pp} | input |
| 30 | P0.7/AD7 | bidirectional |
| 31 | P0.6/AD6 | bidirectional |
| 32 | P0.5/AD5 | bidirectional |
| 33 | P0.4/AD4 | bidirectional |
| 34 | P0.3/AD3 | bidirectional |
| 35 | P0.2/AD2 | bidirectional |
| 36 | P0.1/AD1 | bidirectional |
| 37 | P0.0/AD0 | bidirectional |
| 38 | V_{cc} | power_in |
| 39 | NC | no_connect |
| 40 | P1.0 | bidirectional |
| 41 | P1.1 | bidirectional |
| 43 | P1.3 | bidirectional |
| 44 | P1.4 | bidirectional |
Footprint
ConfirmedPackage_QFP/TQFP-44_10x10mm_P0.8mm
Pad Layout
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44
Pads (44)
| Number | Type |
|---|---|
| 1 | smd |
| 2 | smd |
| 3 | smd |
| 4 | smd |
| 5 | smd |
| 6 | smd |
| 7 | smd |
| 8 | smd |
| 9 | smd |
| 10 | smd |
| 11 | smd |
| 12 | smd |
| 13 | smd |
| 14 | smd |
| 15 | smd |
| 16 | smd |
| 17 | smd |
| 18 | smd |
| 19 | smd |
| 20 | smd |
| 21 | smd |
| 22 | smd |
| 23 | smd |
| 24 | smd |
| 25 | smd |
| 26 | smd |
| 27 | smd |
| 28 | smd |
| 29 | smd |
| 30 | smd |
| 31 | smd |
| 32 | smd |
| 33 | smd |
| 34 | smd |
| 35 | smd |
| 36 | smd |
| 37 | smd |
| 38 | smd |
| 39 | smd |
| 40 | smd |
| 41 | smd |
| 42 | smd |
| 43 | smd |
| 44 | smd |