Renesas Renasas Single-Chip Microcomputer SH7086 Instrukcja Użytkownika Pobierz pdf (Strona 80)

3.2 Functions

Chapter 3 Functions

[ Instruction Code/Number of Cycles ]

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[ Syntax ]

CMP.size (:format) src,dest

[ Description Example ]

[ Selectable src/dest ]

[ Function ]

[ Flag Change ]

CMP CMP

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 SP/SP

R2R0 R3R1 A1A0 R2R0 R3R1 A1A0

(See the next page for

src

dest

classified by format.)

CMP.B:S #10,R0L

CMP.W:G R0,A0

CMP.W #–3,R0

CMP.B #5,Ram:8[FB]

CMP.B A0,R0L

[ Operation ]

dest – src

CoMPare

• Each flag bit of the flag register varies depending on the result of subtraction of

src

from

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.

UIOBSZDC

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.

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

G , Q , S (Can be specified)

B , W

163

Flag

Change

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

src

and

dest

simulta-

neously.

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 ... 307 308

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