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CHAPTER 3 CPU ARCHITECTURE
Preliminary User’s Manual U14581EJ3V0UM00
3.4 Operand Address Addressing
The following methods are available to specify the register and memory (addressing) which undergo manipulation
during instruction execution.
3.4.1 Implied addressing
[Function]
The register which functions as an accumulator (A and AX) in the general register is automatically (implicitly)
addressed.
Of the
µ
PD780852 Subseries instruction words, the following instructions employ implied addressing.
Instruction
Register to be Specified by Implied Addressing
MULU
Register A for multiplicand and register AX for product storage
DIVUW
Register AX for dividend and quotient storage
ADJBA/ADJBS
Register A for storage of numeric values subject to decimal adjustment
ROR4/ROL4
Register A for storage of digit data subject to digit rotation
[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
×
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.
Содержание mPD780852 Series
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