INTRODUCTION
The MC68HC11D3 and MC68HC11D0 are ROM-based high-performance microcontrollers (MCUs) based on the MC68HC11E9 design. Members of the Dx series are derived from the same mask and feature a high speed multiplexed bus capable of running at up to 3 MHz, and a fully static design that allows operations at frequencies to dc.
The only difference between the MCUs in the Dx series is whether or not the ROM has been tested and guaranteed.

FEATUREs
• MC68HC11 CPU
• Power Saving STOP and WAIT Modes
• 4 Kbytes of On-Chip ROM
• 192 Bytes of On-Chip RAM (All Saved During Standby)
• 16-Bit Timer System
   — 3 Input Capture (IC) Channels
   — 4 Output Compare (OC) Channels
   — One IC or OC Channel (Software Selectable)
• 8-Bit Pulse Accumulator
• Real-Time Interrupt Circuit
• Computer Operating Properly (COP) Watchdog System
• Synchronous Serial Peripheral Interface (SPI)
• Asynchronous Nonreturn to Zero (NRZ) Serial Communications Interface (SCI)
• 26 Input/Output (I/O) Pins
   — 16 Bidirectional I/O Pins
   — 3 Input Only Pins
   — 3 Output Only Pins (One Output Only Pin in the 40-Pin Package)
• Available in a 44-Pin Plastic Leaded Chip Carrier (PLCC) and 40-Pin Dual In-Line Package (DIP)