DM163006 datasheet(252/320 Pages) MICROCHIP

252 / 320 page

PIC18C601/801

DS39541A-page 252

Advance Information

 2001 Microchip Technology Inc.

SUBWF

Subtract WREG from f

Syntax:

[ label ] SUBWF f [,d [,a]]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) – (WREG)

→ dest

Status Affected:

N,OV, C, DC, Z

Encoding:

0101

11da

ffff

Description:

Subtract WREG from register 'f'

(2’s complement method). If 'd' is 0,

the result is stored in WREG. If 'd'

is 1, the result is stored back in reg-

ister 'f' (default). If ’a’ is 0, the

Access Bank will be selected, over-

riding the BSR value. If ’a’ is 1, the

Bank will be selected as per the

BSR value.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write to

destination

SUBWF (Cont.)

Example 1:

SUBWF

REG

Before Instruction

REG

WREG

After Instruction

REG

WREG

; result is positive

Example 2:

SUBWF

REG, W

Before Instruction

REG

WREG

After Instruction

REG

WREG

; result is zero

Example 3:

SUBWF

REG

Before Instruction

REG

WREG

After Instruction

REG

0FFh ;(2’s complement)

WREG

; result is negative

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