80c51
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Number | notes |
---|---|
80C31 | ROMless |
80C51 | 4k x 8 ROM |
83C751 | 2k x 8 ROM |
87C51 | 4k x 8 EPROM |
87C751 | 2k x 8 EPROM |
8-bit Microcontroller
Pinout
DIP40 +---\/---+ P1.0 | 1 40| Vdd 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 Vss |20 21| P2.0/A8 +--------+
Frequency
DIP40
Set reader to FREQ, put black probe to GND, red probe to 18 and 19 to measure CPU clock
External links
80C51 page on Wikipedia
80C51 page on CPU-World
Files
-
80C51 Datasheet
-
87C750 Datasheet