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CHAPTER 3 CPU ARCHITECTURE
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
PD780973 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 mPD780973 Series
Страница 2: ...2 MEMO ...
Страница 66: ...66 MEMO ...
Страница 98: ...98 MEMO ...
Страница 138: ...138 MEMO ...
Страница 164: ...164 MEMO ...
Страница 182: ...182 MEMO ...
Страница 204: ...204 MEMO ...
Страница 244: ...244 MEMO ...
Страница 262: ...262 MEMO ...
Страница 278: ...278 MEMO ...
Страница 290: ...290 MEMO ...