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HD404019RFS Datasheet(PDF) 13 Page - Renesas Technology Corp |
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HD404019RFS Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 65 page  HD404019R Series 11 Functional Description Registers and Flags The MCU has nine registers and two flags for the CPU operations (figure 5). CA Carry flag ST Status flag PC Program counter 0 13 Stack pointer 0 1 1 1 5 9 SP SPY SPY register 0 3 SPX SPX register 0 3 Y Y register 0 3 X X register 0 3 B B register 0 3 A Accumulator 0 3 W W register 0 1 1 0 0 Figure 5 Registers and Flags Accumulator (A), B Register (B): The 4-bit accumulator and B register hold the results from the arithmetic logic unit (ALU), and transfer data to/from memory, I/O, and other registers. W Register (W), X Register (X), Y Register (Y): The 2-bit W register, and the 4-bit X and Y registers indirectly address RAM. The Y register is also used for D-port addressing. SPX Register (SPX), SPY Register (SPY): The 4-bit registers SPX and SPY assist the X and Y registers, respectively. Carry Flag (CA): The carry flag (CA) stores the overflow from the ALU generated by an arithmetic operation. It is also affected by the SEC, REC, ROTL, and ROTR instructions. |
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