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HC705J2 Datasheet(PDF) 31 Page - Motorola, Inc |
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HC705J2 Datasheet(HTML) 31 Page - Motorola, Inc |
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31 / 78 page  MOTOROLA CENTRAL PROCESSOR UNIT MC68HC705J2 4-12 4.4 Instruction Set The MCU uses all the instructions available in the M146805 CMOS Family plus the unsigned multiply (MUL) instruction. The MUL instruction allows unsigned multiplication of the contents of the accumulator and the index register. The CPU stores the high-order product in the index register, and the low-order product in the accumulator. The MCU instructions fall into the following five categories: • Register/memory • Read-modify-write • Jump/branch • Bit manipulation • Control 4.4.1 Register/Memory Instructions Most of these instructions use two operands. One operand is in either the accumulator or the index register. The CPU finds the other operand in memory using one of the addressing modes. Most register/memory instructions use the following addressing modes: • Immediate • Direct • Extended • Indexed, no offset • Indexed, 8-bit offset • Indexed, 16-bit offset Table 4-7 lists the register/memory instructions. |
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