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SH7014 bảng dữ liệu(PDF) 53 Page - Renesas Technology Corp

tên linh kiện SH7014
Giải thích chi tiết về linh kiện  32-Bit RISC Microcomputer
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2. CPU
Rev.5.00 Sep. 27, 2007 Page 19 of 716
REJ09B0398-0500
Section 2 CPU
2.1
Register Configuration
The register set consists of sixteen 32-bit general registers, three 32-bit control registers and four
32-bit system registers.
2.1.1
General Registers (Rn)
The sixteen 32-bit general registers (Rn) are numbered R0 to R15. General registers are used for
data processing and address calculation. R0 is also used as an index register. Several instructions
have R0 fixed as their only usable register. R15 is used as the hardware stack pointer (SP). Saving
and recovering the status register (SR) and program counter (PC) in exception processing is
accomplished by referencing the stack using R15. Figure 2.1 shows the general registers.
R0*1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15, SP (hardware stack pointer)*2
0
31
1.
2.
R0 functions as an index register in the indirect indexed register addressing
mode and indirect indexed GBR addressing mode. In some instructions, R0
functions as a fixed source register or destination register.
R15 functions as a hardware stack pointer (SP) during exception processing.
Notes:
Figure 2.1 General Registers



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