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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HD404324FS 데이터시트(PDF) 14 Page - Renesas Technology Corp |
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HD404324FS 데이터시트(HTML) 14 Page - Renesas Technology Corp |
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14 / 103 page  HD404054 Series/HD404094 Series 12 Functional Description Registers and Flags The MCU has nine registers and two flags for CPU operations. They are shown in figure 7 and described below. 30 30 30 30 30 30 0 0 0 13 95 1 (B) (A) (W) (X) (Y) (SPX) (SPY) (CA) (ST) (PC) (SP) 11 11 Accumulator B register W register X register Y register SPX register SPY register Carry Status Program counter Initial value: 0, no R/W Stack pointer Initial value: $3FF, no R/W 0 0 Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: Undefined, R/W Initial value: 1, no R/W Figure 7 Registers and Flags Accumulator (A), B Register (B): Four-bit registers used to hold the results from the arithmetic logic unit (ALU) and transfer data between memory, I/O, and other registers. W Register (W), X Register (X), Y Register (Y): Two-bit (W) and four-bit (X and Y) registers used for indirect RAM addressing. The Y register is also used for D-port addressing. |
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