Renesas Renasas Single-Chip Microcomputer SH7086 Manual de usuario descargar pdf (Pagina 132)

114

3.2 Functions

Chapter 3 Functions

ROTate

Rotate

[ Related Instructions ] ROLC,RORC,SHA,SHL

ROT ROT

[ Syntax ]

ROT.size src,dest

B , W

• This instruction rotates

dest

left or right the number of bits indicated by

src

. The bit overflowing from LSB

(MSB) is transferred to MSB(LSB) and the C flag.

• The direction of rotate is determined by the sign of

src

. If

src

is positive, bits are rotated left; if negative, bits

are rotated right.

• If

src

is an immediate, the number of rotates is –8 to –1 and +1 to +8. You cannot set values less than –8,

equal to 0, or greater than +8.

• If

src

is a register and you selected (.B) for the size specifier (.size), the number of rotates is –8 to +8.

Although you can set 0, no bits are rotated and no flags are changed. If you set a value less than –8 or

greater than +8, the result of rotation is indeterminate.

• If

src

is a register and you selected (.W) for the size specifier (.size), the number of rotates is –16 to +16.

Although you can set 0, no bits are rotated and no flags are changed. If you set a value less than –16 or

greater than +16, the result of rotation is indeterminate.

[ Operation ]

LSB

srcÅÑ0

srcÅÉ0

[ Function ]

MSB

[ Description Example ]

ROT.B #1,R0L ; Rotated left

ROT.B #–1,R0L ; Rotated right

ROT.W R1H,R2

[ Flag Change ]

UIOBSZDC

*1 If

src

is R1H, you cannot choose R1 or R1H for

dest

*2 The range of values that can be taken on is –8 < #IMM < +8. However, you cannot set 0.

[ 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

[ Instruction Code/Number of Cycles ]

Page=

222

dest

Flag

Change

Conditions

S : The flag is set when the operation resulted in MSB = 1; otherwise cleared.

Z : The flag is set when the operation resulted in 0; otherwise cleared.

C : The flag is set when the bit shifted out last is 1; otherwise cleared.

*1 If the number of rotates is 0, no flags are changed.

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 307 308

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