Renesas Renasas Single-Chip Microcomputer SH7086 Uživatelský manuál stáhnout pdf (Strana 134)

116

3.2 Functions

Chapter 3 Functions

SuBtract with Borrow

Subtract with borrow

[ Syntax ]

SBB.size src,dest

[ Operation ]

___

dest dest – src – C

[ Flag Change ]

[ Description Example ]

SBB.B #2,R0L

SBB.W A0,R0

SBB.B A0,R0L ; A0’s 8 low-order bits and R0L are operated on.

SBB.B R0L,A0 ; R0L is zero-expanded and operated with A0.

[ Function ]

• This instruction subtracts

src

and inverted C flag from

dest

and stores the result in

dest

• If

dest

is an A0 or A1 when the size specifier (.size) you selected is (.B),

src

is zero-expanded to

perform operation in 16 bits. If

src

is an A0 or A1, operation is performed on the 8 low-order bits of A0

or A1.

[ Selectable src/dest ]

SBB SBB

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

[ Related Instructions ] ADC,ADCF,ADD,SUB

B , W

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

src

and

dest

simulta-

neously.

Conditions

O : The flag is set when a signed operation resulted in exceeding +32767 (.W) or –32768 (.W), or

+127 (.B) or –128 (.B); otherwise cleared.

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 an unsigned operation resulted in any value equal to or greater than 0;

otherwise cleared.

UIOBSZDC

[ Instruction Code/Number of Cycles ]

Page=

224

Flag

1 2 ... 129 130 131 132 133 134 135 136 137 138 139 ... 307 308

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