8751

8-bit Microcontroller

Pinout

DIP40
           +---\/---+
      P1.0 | 1    40| Vcc
      P1.1 | 2    39| P0.0/AD0
      P1.2 | 3    38| P0.1/AD1
      P1.3 | 4    37| PO.2/AD2
      P1.4 | 5    36| P0.3/AD3
      P1.5 | 6    35| P0.4/AD4
      P1.6 | 7    34| P0.5/AD5
      P1.7 | 8    33| P0.6/AD6
       RST | 9    32| P0.7/AD7
  RXD/P3.0 |10    31| *EA/Vpp
  TXD/P3.1 |11    30| ALE/*PROG
*INT0/P3.2 |12    29| *PSEN
*INT1/P3.3 |13    28| P2.7/A15
   T0/P3.4 |14    27| P2.6/A14
   T1/P3.5 |15    26| P2.5/A13
  *WR/P3.6 |16    25| P2.4/A12
  *RD/P3.7 |17    24| P2.3/A11
     XTAL2 |18    23| P2.2/A10
     XTAL1 |19    22| P2.1/A9
       Vss |20    21| P2.0/A8
           +--------+

Frequency

DIP40
Set reader to FREQ, put black probe to GND, red probe to 15 to measure CPU clock
Guru's comment: 15, 23/24/25(vsync sometimes)

External links

8751 page on Wikipedia
8751 page on CPU-World

Files

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  8751 Datasheet