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MB91302A/V301A Datasheet(PDF) 35 Page - Fuji Electric |
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MB91302A/V301A Datasheet(HTML) 35 Page - Fuji Electric |
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35 / 135 page ![]() MB91301 Series 35 ■ GENERAL PURPOSE REGISTERS General purpose registers R0 to R15 are used by the CPU. The registers are used as the accumulator and memory access pointers for CPU operations. The following three registers are treated as having special meanings to enhance the operation of some instruc- tions. R13 : Virtual accumulator (AC) R14 : Frame pointer (FP) R15 : Stack pointer (SP) The values of R0 to R14 after a reset are undefined. R15 is initialized to 0000 0000H (SSP value) . R0 R1 R12 R13 R14 R15 AC (Accumulator) FP (Frame Pointer) SP (Stack Pointer) XXXX XXXXH XXXX XXXXH 0000 0000H Initial Value 32-bit |
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