Renesas M32R-FPU Manual de usuario descargar pdf (Pagina 104)

3-66

M32R-FPU Software Manual (Rev.1.01)

LDUBLDUB

load/store instruction

Load unsigned byte

[Mnemonic]

(1) LDUB Rdest,@Rsrc

(2)

LDUB Rdest,@(disp16,Rsrc)

[Function]

Load to register from the contents of the memory.

(1) Rdest = *( unsigned char *) Rsrc;

(2) Rdest = *( unsigned char *) ( Rsrc + ( signed short ) disp16 );

[Description]

(1) LDUB zero-extends the byte data from the memory at the address specified by Rsrc and

loads it into Rdest.

(2) LDUB zero-extends the byte data of the memory at the address specified by Rsrc com-

bined

with the 16-bit displacement, and loads it into Rdest.

The displacement value is sign-extended to 32 bits before address calculation.

The condition bit (C) is unchanged.

[EIT occurrence]

None

[Encoding]

dest1010

dest0010

1001 src

LDUB Rdest,@Rsrc

LDUB Rdest,@(disp16,Rsrc)

disp16

INSTRUCTIONS

3.2 Instruction description

1 2 ... 99 100 101 102 103 104 105 106 107 108 109 ... 193 194

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