8xc751

8-bit Microcontroller

Family table

Model	ROM size	RAM size
83C751	2k x 8 ROM	64x8 RAM
87C751	2k x 8 EPROM	64x8 RAM

Pinout

              DIP24-300mil
             SOIC24-300mil
                +--\/--+
        P3.4/A4 |1   24| Vcc
        P3.3/A3 |2   23| P3.57A5
    P3.2/A2/A10 |3   22| P3.6/A6
     P3.1/A1/A9 |4   21| P3.7/A7
     P3.0/A0/A8 |5   20| P1.7/T0/D7
       P0.2/Vpp |6   19| P1.6/*INT1/D6
P0.1/SDA/OE-PGM |7   18| P1.5/*INT0/D5
  P0.0/SLC/ASEL |8   17| P1.4/D4
            RST |9   16| P1.3/D3
             X2 |10  15| P1.2/D2
             X1 |11  14| P1.1/D1
            Vss |12  13| P1.0/D0
                +------+


             LCC28-450x450mil
+---------------------------------------------------------------------+
|  5 NC              | 12 X2      | 19 P1.4/D4       | 26 P3.6/A6     |
|  6 P3.0/A0/A8      | 13 X1      | 20 P1.5/*INT0/D5 | 27 P3.5/A5     |
|  7 P0.2/Vpp        | 14 Vss     | 21 NC            | 28 Vcc         |
|  8 P0.1/SDA/OE-PGM | 15 P1.0/D0 | 22 NC            |  1 P3.4/A4     |
|  9 P0.0/SCLASEL    | 16 P1.1/D1 | 23 P1.6/*INT1/D6 |  2 P3.3/A3     |
| 10 NC              | 17 P1.2/D2 | 24 P1.7/T0/D7    |  3 P3.2/A2/A10 |
| 11 RST             | 18 P1.3/D3 | 25 P3.7/A7       |  4 P3.1/A1/A9  |
+---------------------------------------------------------------------+

Frequency

DIP24 and SOIC24
Set reader to FREQ, put black probe to GND, red probe to 10 and 11 to measure CPU clock

PLCC28
Set reader to FREQ, put black probe to GND, red probe to 12 and 13 to measure CPU clock

External links

6502 page on Wikipedia
6502 page on CPU-World
4040 page on CPU-Galaxy DRAM page on wikipedia

Files

• 

  8xC751 Datasheet