89c52

8-bit Microcontroler

Pinout

DIP40
            +---\/---+
    T2/P1.0 | 1    40| Vcc
  T2EX/P1.1 | 2    39| P0.0/AD0
       P1.2 | 3    38| P0.1/AD1
       P1.3 | 4    37| P0.2/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
        GND |20    21| P2.0/A8
            +--------+

Frequency

DIP40
Set reader to FREQ, put black probe to GND, red probe to 18, 19 to measure CPU clock

Files

• 
  AT89C52 Datasheet