Dallas Semiconductor

DS80C310 - High-Speed Microcontroller

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Features Backward 80C32-compatible and forward DS80C320-compatible 8051 pin- and instruction set-compatible: Three 16-bit timer/counters Full duplex serial port 256 bytes scratchpad RAM Multiplexed address/data bus Addresses 64kB ROM and 64kB RAM High-speed architecture: 4 clocks/machine cycle (8051 = 12) Runs DC to 33MHz clock rates Single-cycle instruction in 121ns Dual data pointer Optional variable length MOVX to access fast/slow RAM /peripherals 10 total interrupt sources with 6 external Internal power-on reset circuit

Pin Description Pin Number Description 1-8 Port 1 - I/O 9 RST - Input 10-17 Port 3 - I/O 18 XTAL1 - Crystal 19 XTAL2 - Crystal 20 GND - Ground 21-28 Port 2 - Output 29 PSEN - Output 30 ALE - Output 32-39 Port 0 - I/O 40 Vcc - +5V Power Supply

Pin Layout Dimensional Drawing

Technical Data Data Sheet Dallas Semiconductor - Data Sheet for DS80C310 Application Notes Dallas Semiconductor - App Note 91: Microcontroller Design Guidelines for Reducing ALE Signal Noise