32170 datasheet(49/881 Pages) RENESAS

номер детали	32170

подробное описание детали	32-bit RISC Single-chip Microcomputers

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2-2

32170/32174 Group User's Manual (Rev. 2.1)

CPU

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.

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.

Figure 2.2.1 General-purpose Registers

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