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UPD6P9 Datasheet(PDF) 16 Page - Renesas Technology Corp |
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UPD6P9 Datasheet(HTML) 16 Page - Renesas Technology Corp |
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16 / 45 page  14 µPD6P9 Data Sheet U15144EJ1V1DS 3.6 Data Pointer (DP): 12 Bits The ROM data table can be referenced by setting the ROM address in the data pointer to call the ROM contents. The lower 8 bits of the ROM address are specified by R0 of the data memory; and the higher 4 bits by bits 4 to 7 of the P3 register (CR0). After reset, the pointer contents become 000H. Figure 3-5. Data Pointer Configuration 3.7 Accumulator (A): 4 Bits The accumulator, which refers to a register consisting of 4 bits, plays a leading role in performing various operations. After reset, the accumulator contents are left undefined. Figure 3-6. Accumulator Configuration A3 A2 A1 A0 A 3.8 Arithmetic and Logic Unit (ALU): 4 Bits The arithmetic and logic unit (ALU), which refers to an arithmetic circuit consisting of 4 bits, executes simple (mainly logical) operations. R00 DP9 DP8 DP7 DP6 DP5 DP4 DP3 DP2 DP1 DP0 R10 R0 b4 b5 P3 register P3 DP10 b6 DP11 b7 |
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