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W65C134S 8-bit MCU


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The W65C134S is a feature rich 8–bit microcomputer based on the W65C02 with an advanced (originally designed for life support) Serial Interface Bus (SIB) token passing local area network for multi–W65C134S processor systems. The W65C134S has a full external memory bus (8–bit data and 16–bit address bus) for flexible system design. This MCU has an embedded debug monitor ROM with a library of routines that can help you reduce development time.

Features of the W65C134S

  • Full Software Selectable External Memory Bus
  • 8−bit Data Bus
  • 16−bit Address Bus
  • 65Kbyte Memory and Memory Mapped IO Space
  • Fully Static for Power and Radiation Management
  • 8MHz Operating Bus Speed
  • Industrial temperature range
  • 2.8V − 5.5V power supply
  • 56 CMOS compatible I/O lines
  • 4096 x 8 Embedded Monitor ROM
  • 192 x 8 On−Chip Static RAM
  • Power management features
  • 22 priority encoded interrupts
  • UART 7/8−bit w/wo odd or even parity
  • Serial Interface Bus (SIB) for Token Passing LAN
  • 4 x 16 bit timer/counter
  • Watch Dog Timer
  • 8 Decoded Chip Select outputs
  • Time of Day (ToD) clock features


W65C134S Programming Model