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UPD703100 Datasheet(PDF) 79 Page - NEC |
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UPD703100 Datasheet(HTML) 79 Page - NEC |
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79 / 185 page  CHAPTER 5 INSTRUCTIONS User’s Manual U12197EJ6V0UM 79 15 0 31 16 (5) rrrrr111111RRRRR ddddddddddddddd1 ddddddddddddddd is the higher 15 bits of disp16. Flag CY – OV – S – Z – SAT – Instruction (1) LD.B Load Byte (2) LD.H Load Half-word (3) LD.W Load Word (4) LD.BU Load Byte Unsigned (5) LD.HU Load Half-word Unsigned Explanation (1) Adds the data of general-purpose register reg1 to a 16-bit displacement sign-extended to word length to generate a 32-bit address. Byte data is read from the generated address, sign-extended to word length, and stored in general-purpose register reg2. (2) Adds the data of general-purpose register reg1 to a 16-bit displacement sign-extended to word length to generate a 32-bit address. Halfword data is read from this 32-bit address with its bit 0 masked by 0, sign-extended to word length, and stored in general-purpose register reg2. (3) Adds the data of general-purpose register reg1 to a 16-bit displacement sign-extended to word length to generate a 32-bit address. Word data is read from this 32-bit address with bits 0 and 1 masked by 0, and stored in general-purpose register reg2. (4) Adds the data of general-purpose register reg1 to a 16-bit displacement sign-extended to word length to generate a 32-bit address. Byte data is read from the generated address, zero-extended to word length, and stored in general-purpose register reg2. Do not specify r0 as the destination register reg2. (5) Adds the data of general-purpose register reg1 to a 16-bit displacement sign-extended to word length to generate a 32-bit address. Halfword data is read from this 32-bit address with its bit 0 masked by 0, zero-extended to word length, and stored in general-purpose register reg2. Do not specify r0 as the destination register reg2. Caution The result of adding the data of general-purpose register reg1 and the 16-bit displacement sign-extended to word length is as follows. • Lower bits are not masked and address is generated. |
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