Atmel

T89C51RC2- 8 bit Microcontroller with 32k Bytes Flash

Photograph

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 16K/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 Temperature ranges: COmmercial (0 to +70°C) and Industrial (-40°C to +85 °C)

Pin Description Pin Number Description 1 NIC - No Internal Connection 2-9 P1.0 - P1.7 - Port 1 10 RST - Reset 11 P3.0 - Port 3 12 NIC - No Internal Connection 13-19 P3.1 - P3.7 - Port 3 20 XTAL2 - Crystal 21 XTAL1 - Crystal 22 VSS 23 NIC - No Internal Connection 24-31 P2.0 - P2.7 - Port 2 32 PSEN - Program Store Enable 33 ALE - Address Latch Enable 34 NIC - No Internal Connection 35 EA - External Access Enable 36-43 P0.7 - P0.0 - Port 0 44 Vcc - Positive Power Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Atmel - Data Sheet for T89C51RB2 Application Notes Atmel - 80 Series Application Notes