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T89C51RB2 - T89C51RB2 44-pin 32kByte 80 Series Microcontroller Technical Data
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Features
- 80C52 Compatible
- Variable Length MOVX for slow RAM/Peripherals
- ISP using Standard Vcc Power Supply
- Boot ROM Contains Low Level FLASH Programming Routines and a Default Serial Loader
- High-Speed Architecture
- 32K Bytes on-chip FLASH Program/Data Memory
- On-chip 1024 Bytes Expanded RAM (XRAM)
- Keyboard Interrupt Interface on port P1
- SPI Interface (Master/Slave Mode)
- 8-bit Clock Prescaler
- Improved X2 Mode with Independent Selection for CPU and each Peripheral
- Asynchronous Port Reset
- Full Duplex Enhanced UART
- Dedicated Baud Rate Generator for UART
- Low EMI
- Hardware Watchdog Timer (One-time enabled with Reset-Out)
- Power Control Modes
- Power Supply: 4.5 to 5.5V or 2.7 to 3.6V
Pin Layout
Pin Description
| Pin Number | Description |
|---|---|
| 1 | NC - Not Connected |
| 2 - 9 | P1.0 - P1.7 - Port 1 |
| 10 | RST - Reset |
| 11 | P3.0 - Port 3 |
| 12 | NC - Not Connected |
| 13 - 19 | P3.1 - P3.7 - Port 3 |
| 20 | XTAL2 - Crystal |
| 21 | XTAL1 - Crystal |
| 22 | VSS - Ground |
| 23 | NC - Not Connected |
| 24 - 31 | P2.0 - P2.7 - Port 2 |
| 32 | PSEN - Program Store Enable |
| 33 | ALE - Address Latch Enable |
| 34 | NC - Not Connected |
| 35 | EA - External Access Enable |
| 36 - 43 | P0.7 - P0.0 - Port 0 |
| 44 | Vcc - Positive Power Supply |
Dimensional Drawing
Technical Data
