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UPD703100 Datasheet(PDF) 22 Page - NEC |
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UPD703100 Datasheet(HTML) 22 Page - NEC |
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22 / 185 page  CHAPTER 2 REGISTER SET User’s Manual U12197EJ6V0UM 22 Figure 2-2. Program Register Operations Name Usage Operation r0 Zero register Always holds 0. r1 Assembler-reserved register Used as working register for address generation. r2 Address/data variable registers (when the real-time OS does not use r2) r3 Stack pointer Used for stack frame generation when function is called. r4 Global pointer Used to access global variable in data area. r5 Text pointer Used as register for pointing start address of text area Note r6 to r29 Address/data variable registers r30 Element pointer Used as base pointer for address generation when memory is accessed. r31 Link pointer Used when compiler calls function. PC Program counter Holds instruction address during program execution. Note Text area: Area where program code is placed. Remark For detailed descriptions of r1, r3, r4, r5, r31 used by the assembler and C compiler, see the CA850 (C Compiler Package) User’s Manual. (2) Program counter This register holds an instruction address during program execution. The lower 26 bits of this register are valid, and bits 31 through 26 are reserved fields (fixed to 0). If a carry occurs from bit 25 to 26, it is ignored. Bit 0 is always fixed to 0, and execution cannot branch to an odd address. 31 PC RFU 0 2625 1 0 Remark RFU: Reserved field (Reserved for Future Use) |
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