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The 87C51 is a single-chip control-oriented microcontroller. The 87C51BHP is identical to the 87C51BH. When ordering the 87C51BHP, customers must submit the 64-byte encryption table together with the ROM code. Lock bit 1 will be set to enable the internal ROM code protection and at the same time allows code verification. The extremely low operating power, along with the two reduced power modes, Idle and Power Down, make this part is very suitable for low-power applications.
87C51 Pinout
87C51 Pin Configuration
| Pin Number | Pin Name | Description |
|---|---|---|
| 1-8 | P1.0-P1.7 | Port 1 |
| 9 | RST | Reset |
| 10 | P3.0/RXD | Port 3.0 / Serial Receive Pin |
| 11 | P3.1/TXD | Port 3.1 / Serial Transmit Pin |
| 12 | P3.2/INT0 | Port 3.2 / Interrupt 0 (Active Low) |
| 13 | P3.3/INT1 | Port 3.3 / Interrupt 1 (Active Low) |
| 14 | P3.4/T0 | Port 3.4 / Timer 0 |
| 15 | P3.5/T1 | Port 3.5 / Timer 1 |
| 16 | P3.6/WR | Port 3.6 / Write (Active Low) |
| 17 | P3.7/RD | Port 3.7 / Read (Active Low) |
| 18 | XTAL2 | Crystal Input |
| 19 | XTAL1 | Crystal Input |
| 20 | Vss | Ground |
| 21-28 | P2.0-P2.7 | Port 2 |
| 29 | PSEN | Program Store Enable (Active Low) |
| 30 | ALE | Address Latch Enable |
| 31 | EA | External Memory Enable (Active Low) |
| 32-39 | P0.7-P0.1 | Port 0 |
| 40 | Vcc | Positive Supply |
87C51 Key Features
- High Performance CHMOS EPROM
- 24 MHz Operation
- Improved Quick-Pulse Programming Algorithm
- 3-Level Program Memory Lock
- Boolean Processor
- 128-Byte Data RAM
- 32 Programmable I/O Lines
- Two 16-Bit Timer/Counters
- Extended Temperature Range (b40C to a85C)
Application
- Low-power applications
You can download this datasheet for 87C51 CPU with EPROM and RAM – Datasheet from the link given below:
