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MC908QY1AMDWE Datasheet(PDF) 65 Page - Freescale Semiconductor, Inc |
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MC908QY1AMDWE Datasheet(HTML) 65 Page - Freescale Semiconductor, Inc |
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65 / 200 page  MC68HC908QYA/QTA Family Data Sheet, Rev. 3 Freescale Semiconductor 65 Chapter 7 Central Processor Unit (CPU) 7.1 Introduction The M68HC08 CPU (central processor unit) is an enhanced and fully object-code-compatible version of the M68HC05 CPU. The CPU08 Reference Manual (document order number CPU08RM/AD) contains a description of the CPU instruction set, addressing modes, and architecture. 7.2 Features Features of the CPU include: • Object code fully upward-compatible with M68HC05 Family • 16-bit stack pointer with stack manipulation instructions • 16-bit index register with x-register manipulation instructions • 8-MHz CPU internal bus frequency • 64-Kbyte program/data memory space • 16 addressing modes • Memory-to-memory data moves without using accumulator • Fast 8-bit by 8-bit multiply and 16-bit by 8-bit divide instructions • Enhanced binary-coded decimal (BCD) data handling • Modular architecture with expandable internal bus definition for extension of addressing range beyond 64 Kbytes • Low-power stop and wait modes 7.3 CPU Registers Figure 7-1 shows the five CPU registers. CPU registers are not part of the memory map. |
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