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3-63 M32R-FPU Software Manual (Rev.1.01)
LDBLDB
load/store instruction
Load byte
[Mnemonic]
(1) LDB Rdest,@Rsrc
(2)
LDB Rdest,@(disp16,Rsrc)
[Function]
Load to register from the contents of the memory.
(1) Rdest = *( signed char *) Rsrc;
(2) Rdest = *( signed char *) ( Rsrc + ( signed short ) disp16 );
[Description]
(1) LDB sign-extends the byte data of the memory at the address specified by Rsrc and loads
it into Rdest.
(2) LDB sign-extends the byte data of the memory at the address specified by Rsrc combined
with the 16-bit displacement, and loads it into Rdest.
The displacement value is sign-extended to 32 bits before the address calculation.
The condition bit (C) is unchanged.
[EIT occurrence]
None
[Encoding]
dest1010
dest0010
1000 src
1000 src
disp16
LDB Rdest,@Rsrc
LDB Rdest,@(disp16,Rsrc)
INSTRUCTIONS
3.2 Instruction description