Section 2 CPU
Rev. 0.50 May 18, 2006 Page 23 of 1588
REJ09B0313-0050
Section 2 CPU
2.1 Register
Configuration
The register set consists of sixteen 32-bit general registers, four 32-bit control registers, and four
32-bit system registers.
2.1.1 General
Registers
Figure 2.1 shows the general registers.
The sixteen 32-bit general registers 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
restoring the status register (SR) and program counter (PC) in exception handling is accomplished
by referencing the stack using R15.
31
0
R0
*
1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15, SP (hardware stack pointer)
*
2
Notes: 1. R0 functions as an index register in the indexed register indirect addressing mode and indexed GBR indirect
addressing mode. In some instructions, R0 functions as a fixed source register or destination register.
2. R15 functions as a hardware stack pointer (SP) during exception processing.
Figure 2.1 General Registers
Содержание Single-Chip Microcomputer SH7203
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Страница 1598: ...Section 31 Electrical Characteristics Rev 0 50 May 18 2006 Page 1568 of 1588 REJ09B0313 0050 ...
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