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MB91155 Datasheet(PDF) 23 Page - fujitsu semiconductor |
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MB91155 Datasheet(HTML) 23 Page - fujitsu semiconductor |
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23 / 105 page  MB91F155A/MB91155/MB91154 23 s s s s GENERAL-PURPOSE REGISTERS General-purpose registers are CPU registers R0 through R15 and used as accumulators during various oper- ations and as memory access pointers (fields indicating addresses) . Of the 16 general-purpose registers, the following registers are assumed for specific applications. For this reason, some instructions are enhanced. R13 : Virtual accumulator (AC) R14 : Frame pointer (FP) R15 : Stack pointer (SP) Initial values to which R0 through R14 are reset are not defined. The initial value of R15 is 0000 0000H (the SSP value) . • Register Bank Configuration R0 R1 R12 R13 R14 R15 AC (Accumulator) FP (Frame Pointer) SP (Stack Pointer) XXXX XXXXH Initial value XXXX XXXXH 0000 0000H 32 bit |
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