The AT89S8252 is a low-power, high-performance CMOS 8-bit microcomputer with 8K bytes of downloadable Flash programmable and erasable read only memory and 2K bytes of EEPROM. The device is manufactured using Atmel’s high-density nonvolatile memory technology and is compatible with the industry-standard 80C51 instruction set and pinout. The on-chip downloadable Flash allows the program memory to be reprogrammed in-system through an SPI serial interface or by a conventional nonvolatile memory programmer. By combining a versatile 8-bit CPU with downloadable Flash on a monolithic chip, the Atmel AT89S8252 is a powerful microcomputer which provides a highly-flexible and cost-effective solution to many embedded control applications.
Features:-
- Compatible with MCS-51™ Products
- 8K Bytes of In-System Reprogrammable Downloadable Flash Memory
- SPI Serial Interface for Program Downloading
- Endurance: 1,000 Write/Erase Cycles
- 2K Bytes EEPROM
- Endurance: 100,000 Write/Erase Cycles
- 4V to 6V Operating Range
- Fully Static Operation: 0 Hz to 24 MHz
- Three-level Program Memory Lock
- 256 x 8-bit Internal RAM
- 32 Programmable I/O Lines
- Three 16-bit Timer/Counters
- Nine Interrupt Sources
- Programmable UART Serial Channel
- SPI Serial Interface
- Low-power Idle and Power-down Modes
- Interrupt Recovery From Power-down
- Programmable Watchdog Timer
- Dual Data Pointer
- Power-off Flag
Pin Out
Pin Description
| Pin Number | Description |
|---|---|
| 1 – 8 | P1.0-P1.7 – Port 1 |
| 9 | RESET – Reset (Active Low) |
| 10 – 17 | P3.0-P3.7 – Port 3 |
| 18 | XTAL2 – Crystal |
| 19 | XTAL1 – Crystal |
| 20 | GND – Ground |
| 21 – 28 | P2.0-P2.7 – Port 2 |
| 29 | PSEN – Program Store Enable |
| 30 | ALE – Address Latch Enable |
| 31 | EA – External Access Enable |
| 32 – 39 | P0.7-P0.1 – Port 0 |
| 40 | Vcc – Positive Power Supply |
