MC68HC705K1 Datasheet, PDF (100/140 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Instruction Set
Freescale Semiconductor, Inc.
11.2 Introduction
The microcontroller unit (MCU) instruction set has 62 instructions and
uses eight addressing modes. The instructions include all those of the
M146805 CMOS Family plus one more: the unsigned multiply (MUL)
instruction. The MUL instruction allows unsigned multiplication of the
contents of the accumulator (A) and the index register (X). The
high-order product is stored in the index register, and the low-order
product is stored in the accumulator.
11.3 Addressing Modes
The central processor unit (CPU) uses eight addressing modes for
flexibility in accessing data. The addressing modes provide eight
different ways for the CPU to find the data required to execute an
instruction.
The eight addressing modes are:
• Inherent
• Immediate
• Direct
• Extended
• Indexed, no offset
• Indexed, 8-bit offset
• Indexed, 16-bit offset
• Relative
Technical Data
Instruction Set
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MC68HC705K1 — Rev. 2.0