General Description
Introduction
This section depicts the general characteristics and features of the MC68HC711D3 high-density complementary metal-oxide semiconductor (HCMOS) microcontroller unit (MCU).

The MC68HC711D3 contains highly sophisticated on-chip peripheral functions. This high-speed, low-power programmable read-only memory (PROM) MCU has a nominal bus speed of 3 MHz. The fully static design allows operations at frequencies down to dc.

The MC68HC11D3 and MC68HC11D0 are read-only memory (ROM) based high-performance microcontrollers (MCU) based on the MC68HC11E9 design. The MC68L11D0 is an extended-voltage version of the MC68HC11D0 that can operate in applications that requiresupply voltages as low as 3.0 V. The information in this document pertains to all the devices with the exceptions noted in Appendix A. MC68HC11D3 and MC68HC11D0and Appendix B. MC68L11D0.

FEATUREs
Features of the MC68HC711D3 include:
• Expanded 16-bit timer system with four-stage programmable prescaler
• Non-return-to-zero (NRZ) serial communications interface (SCI)
• Power-saving stop and wait modes
• 64 Kbytes memory addressability
• Multiplexed address/data bus
• Serial peripheral interface (SPI)
• 4 Kbytes of one-time programmable read-only memory (OTPROM)
• 8-bit pulse accumulator circuit
• 192 bytes of static random-access memory (RAM) (all saved during standby)
• Real-time interrupt (RTI) circuit
• Computer operating properly (COP) watchdog system
• Available in these packages:
– 40-pin plastic dual in-line package (DIP)
– 44-pin plastic leaded chip carrier (PLCC)
– 44-pin plastic quad flat pack (QFP)