| Part number | 87C54, 87C52 |
|---|---|
| Manufacturer | Intel |
| File Size | 236.66 KB |
| Description | CHMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| Datasheet |
 87C52-Intel.pdf
|
| Note |
This datasheet PDF includes multiple part numbers: 87C54, 87C52. Please refer to the document for exact specifications by model. |
VCC Supply voltage VSS Circuit ground VSS1 Secondary ground (not on DIP) Provided to reduce ground bounce and improve power supply by-passing NOTE This pin is not a substitute for the VSS pin (pin 22) (Connection not necessary for proper operation ) Port 0 Port 0 is an 8-bit open drain bidirectional I O port As an output port each pin can sink several LS TTL inputs Port 0 pins that have 1’s written to them float and in that state can be used as high-impedance inputs Port 0 is also the multiplex
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