16

Motorola MC68HC11/12 Family

Chapter Outline

  • Learn a distinct architecture from 8051 that is present in 68HC11/12 family MCUs
  • Understand addressing modes, instructions and memory map in 68HC11/12
  • Study powerful features of 10s, SPI, SCI and timers and their applications
16.1 ARCHITECTURE

16.1.1 CPU Registers and Internal Buses

Figure 16.1 shows nine CPU registers, PCL, PCH, IYL, IYH, IXL, IXH, ACCA, ACCB and CCR and internal buses in 68HC11. The architecture has features are as follows:

  1. 68HC11 is an 8-bit microcontroller. MCU is designed using HCMOS (highspeed complementary MOSFET) technology. Clock frequency can be reduced to 0 since MCU is completely MOSFET-based. The power dissipation is negligible in the state of stop or wait. Stop ...

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