PIC16LC8X 查看數據表（PDF） - Microchip Technology

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PIC16LC8X

8-Bit CMOS EEPROM Microcontrollers

Microchip Technology 

PIC16C8X

SUBLW

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example 1:

Example 2:

Example 3:

Subtract W from Literal

[ label ] SUBLW k

0 ≤ k ≤ 255

k – (W) → (W)

C, DC, Z

11 110x kkkk kkkk

The W register is subtracted (2’s

complement method) from the

eight bit literal 'k'. The result is

placed in the W register.

1

1

SUBLW 0x02

Before Instruction

W =1

C =?

After Instruction

W =1

C = 1; result is positive

Before Instruction

W =2

C =?

After Instruction

W =0

C = 1; result is zero

Before Instruction

W =3

C =?

After Instruction

W = FF

C = 0; result is negative

SUBWF

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Example 1:

Example 2:

Example 3:

Subtract W from f

[ label ] SUBWF f,d

0 ≤ f ≤ 127

d ∈ [0,1]

(f) – (W) → (dest)

C, DC, Z

00 0010 dfff ffff

Subtract (2’s complement meth-

odize W register from register 'f'.

If 'd' is 0 the result is stored in

the W register. If 'd' is 1 the

result is stored back in register

'f'.

1

1

SUBWF REG1,1

Before Instruction

REG1 = 3

W

=2

C

=?

After Instruction

REG1 = 1

W

=2

C

= 1; result is positive

Before Instruction

REG1 = 2

W

=2

C

=?

After Instruction

REG1 = 0

W

=2

C

= 1; result is zero

Before Instruction

REG1 = 1

W

=2

C

=?

After Instruction

REG1 = FF

W

=2

C

= 0; result is negative

© 1995 Microchip Technology Inc.

DS30081F-page 63

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