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5.4.2 Implied addressing
[Function]
The register which functions as an accumulator (A and AX) in the general register is automatically (implicitly)
addressed.
Of the µ PD78014 and 78014Y Subseries instruction words, the following instructions employ implied addressing.
MULU
DIVUW
ADJBA/ADJBS
ROR4/ROL4
[Operand format]
Because implied addressing can be automatically employed with an instruction, no particular operand format is
necessary.
[Description example]
In the case of MULU X
With an 8-bit x 8-bit multiply instruction, the product of A register and X register is stored in AX. In this example,
the A and AX registers are specified by implied addressing.
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CHAPTER 5 CPU ARCHITECTURE
Instruction
Register to be Specified by Implied Addressing
A register for multiplicand and AX register for product storage
AX register for dividend and quotient storage
A register for storage of numeric values subject to decimal adjustment
A register for storage of digit data which undergoes digit rotation
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