參數(shù)資料
型號(hào): μPD703008
廠商: NEC Corp.
英文描述: 16/32 Bit RISC Microcontrollers(16/32位RISC微控制器)
中文描述: 16/32位RISC微控制器(16/32位的RISC微控制器)
文件頁(yè)數(shù): 17/141頁(yè)
文件大?。?/td> 374K
代理商: ΜPD703008
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CHAPTER 2 REGISTER SET
The registers of the V850 family can be classified into two types: program register sets that can be used for general
programming, and system registers that can control the execution environment. All the registers are 32 bits wide.
2.1 Program Registers
2.1.1 Program register set
(1) General registers
The V850 family has thirty-two general registers, r0 through r31. All these registers can be used for data or
address storage.
However, r0 and r30 are implicitly used by instructions, and care must be exercised in using these registers. r0
is a register that always holds 0, and is used for operations and offset 0 addressing. r30 is used as a base pointer
when accessing memory using the SLD and SST instructions. r1, r2, r3, r4, r5, and r31 are implicitly used by
the assembler and C compiler. Before using these registers, therefore, their contents must be saved so that they
are not lost. The contents must be restored to the registers after the registers have been used.
5
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