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32170 Datasheet(PDF) 49 Page - Renesas Technology Corp

Part # 32170
Description  32-bit RISC Single-chip Microcomputers
PDF  881 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

32170 Datasheet(HTML) 49 Page - Renesas Technology Corp

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2
2-2
32170/32174 Group User's Manual (Rev. 2.1)
CPU
2.1 CPU Registers
2.1 CPU Registers
The M32R has sixteen general-purpose registers, five control registers, an accumulator, and a
program counter. The accumulator is a 56-bit configuration, and all other registers are a 32-bit
configuration.
2.2 General-purpose Registers
General-purpose registers are 32 bits in width and there are sixteen of them (R0 to R15), which are
used to hold data and base addresses. Especially, R14 is used as a link register, and R15 is used
as a stack pointer. The link register is used to store the return address when executing a subroutine
call instruction. The stack pointer is switched between an interrupt stack pointer (SPI) and a user
stack pointer (SPU) depending on the value of the Processor Status Word register (PSW)'s stack
mode (SM) bit.
31
31
00
R8
R9
R10
R11
R12
R13
R14 (Link register)
R15 (Stack pointer)
(Note)
Note: The stack pointer is switched between an interrupt stack pointer (SPI) and a user stack pointer
(SPU) depending on the value of the PSW's SM bit.
R0
R1
R2
R3
R4
R5
R6
R7
Figure 2.2.1 General-purpose Registers



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