                        p  BiDiPro
                        


                   AT89C5X - Flash Microcontroller

                           Ŀ
  16 A0 ------------ P1.0 Ĵ 1  40 VCC ----------- Vcc 36
  15 A1 ------------ P1.1 Ĵ 289C5139 P0.0 ---------- D0  17
  14 A2 ------------ P1.2 Ĵ 3     38 P0.1 ---------- D1  18
  13 A3 ------------ P1.3 Ĵ 4     37 P0.2 ---------- D2  19
  12 A4 ------------ P1.4 Ĵ 5     36 P0.3 ---------- D3  21
  11 A5 ------------ P1.5 Ĵ 6     35 P0.4 ---------- D4  22
  10 A6 ------------ P1.6 Ĵ 7     34 P0.5 ---------- D5  23
   9 A7 ------------ P1.7 Ĵ 8     33 P0.6 ---------- D6  24
  36 Vcc---####----- RST  Ĵ 9     32 P0.7 ---------- D7  25
            1K                                 510
                     P3.0 Ĵ10     31 VPP  ---####--- A19  5
                     P3.1 Ĵ11     30 /PROG --------- CE  26
                     P3.2 Ĵ12     29 /PSEN --------- GND 20
                     P3.3 Ĵ13       
                     P3.4 Ĵ14     28 P2.7 ---------- A17 34
                     P3.5 Ĵ15     27 P2.6 ---------- A16  6
  35 A18------------ P3.6 Ĵ16     26 P2.5 ---------- A13 32
  28 OE ------------ P3.7 Ĵ17     25 P2.4 ---------- A12  8
         4MHzĴXTAL2Ĵ18     24 P2.3 ---------- A11 29
             ĳXTAL1Ĵ19     23 P2.2 ---------- A10 27
      27p C1 C2             22 P2.1 ---------- A9  30
  20 Gnd----- VSS Ĵ20     21 P2.0 ---------- A8  31
                           

                               VD1
                      Vcc o----|>|----> A19
                                3K
                      Gnd o----####---> P3.7 (pin 17)
                                3K
                      Gnd o----####---> P2.3 (pin 24)

