8-Bit Microcontroller

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Product Details


  • 80C51 Central Processing Unit (CPU)
  • 64 kbytes ROM (only P83C557E8)
  • 64 kbytes EPROM (only P87C557E8)
  • ROM/EPROM Code protection
  • 2048 bytes RAM, expandable externally to 64 kbytes
  • Two standard 16-bit timers/counters
  • An additional 16-bit timer/counter coupled to four capture registers and three compare registers
  • A 10-bit Analog-to-Digital Converter (ADC) with eight multiplexed analog inputs and programmable autoscan vTwo 8-bit resolution, Pulse Width Modulation outputs
  • Five 8-bit I/O ports plus one 8-bit input port shared with analog inputs
  • I²C-bus serial I/O port with byte oriented controller and target functions
  • Full-duplex UART compatible with the standard 80C51
  • On-chip Watchdog Timer
  • 15 interrupt sources with 2 priority levels (2 to 6 external sources possible)
  • Phase-Locked Loop (PLL) oscillator with 32 kHz reference and software-selectable system clock frequency
  • Seconds timer
  • Software enable/disable of ALE output pulse
  • Electromagnetic compatibility improvements
  • Wake-up from Power-down by external or seconds interrupt
  • Frequency range for 80C51-family standard oscillator: 3.5 to 16 MHz
  • Extended temperature range: -40 to +85 Cel
  • Supply voltage: 4.5 to 5.5 V.


Quick reference to our documentation types.

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