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1-15 M32R-FPU Software Manual (Rev.1.01)
1.7 Addressing Mode
M32R-FPU supports the following addressing modes.
(1) Register direct [R or CR]
The general-purpose register or the control register to be processed is
specified.
(2) Register indirect [@R]
The contents of the register specify the address of the memory. This mode
can be used by all load/store instructions.
(3) Register relative indirect [@(disp, R)]
(The contents of the register) + (16-bit immediate value which is sign-
extended to 32 bits) specify the address of the memory.
(4) Register indirect and register update
• Adds 4 to register contents [@R+]
The contents of the register specify the memory address, then 4 is added to
the register contents.
(Can only be specified with LD instruction).
• Add 2 to register contents [@R+] [M32R-FPU extended addressing mode]
The contents of the register specify the memory address, then 2 is added to
the register contents.
(Can only be specified with STH instruction).
• Add 4 to register contents [@+R]
The contents of the register is added by 4, the register contents specify the
memory address.
(Can only be specified with ST instruction).
• Subtract 4 to register contents [@–R]
The content of the register is decreased by 4, then the register contents
specify the memory address.
(Can only be specified with ST instruction).
(5) immediate [#imm]
The 4-, 5-, 8-, 16- or 24-bit immediate value.
(6) PC relative [pcdisp]
(The contents of PC) + (8, 16, or 24-bit displacement which is sign-extended
to 32 bits and 2 bits left-shifted) specify the address of memory.
CPU PROGRAMMING MODEL
1.7 Addressing Mode