Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 114)

3.2 Functions

Chapter 3 Functions

MULtiple

Signed multiply

[ Syntax ]

MUL.size src,dest

[ Description Example ]

[ Related Instructions ] DIV,DIVU,DIVX,MULU

[ Function ]

MUL MUL

B , W

[ Operation ]

dest dest src

• This instruction multiplies

src

and

dest

together including the sign bits and stores the result in

dest

• If you selected (.B) for the size specifier (.size),

src

and

dest

both are operated on in 8 bits and the

result is stored in 16 bits. If you specified an A0 or A1 for either

src

dest

, operation is performed on

the 8 low-order bits of A0 or A1.

• If you selected (.W) for the size specifier (.size),

src

and

dest

both are operated on in 16 bits and the

result is stored in 32 bits. If you specified R0, R1, or A0 for

dest

, the result is stored in R2R0, R3R1, or

A1A0 accordingly.

MUL.B A0,R0L

MUL.W #3,R0

MUL.B R0L,R1L

MUL.W A0,Ram

[ Selectable src/dest ]

src dest

R0L/R0 R0H/R1 R1L/R2 R1H/R3 R0L/R0 R0H/R1 R1L/R2 R1H/R3

A0/A0

A1/A1

[A0] [A1] A0/A0

A1/A1 [A0] [A1]

dsp:8[A0] dsp:8[A1] dsp:8[SB] dsp:8[FB] dsp:8[A0] dsp:8[A1] dsp:8[SB] dsp:8[FB]

dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16 dsp:16[A0] dsp:16[A1] dsp:16[SB] abs16

dsp:20[A0] dsp:20[A1] abs20 #IMM dsp:20[A0] dsp:20[A1] abs20

R2R0 R3R1 A1A0 R2R0 R3R1 A1A0

*1 If you specify (.B) for the size specifier (.size), you cannot choose A0 or A1 for

src

and

dest

simulta-

neously.

[ Flag Change ]

UIOBSZDC

[ Instruction Code/Number of Cycles ]

Page=

205

Flag

Change

; R0L and A0’s 8 low-order bits are multiplied.

1 2 ... 109 110 111 112 113 114 115 116 117 118 119 ... 307 308

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