PIC18LF4331 datasheet(302/392 Pages) MICROCHIP

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PIC18F2331/2431/4331/4431

DS39616D-page 302

 2010 Microchip Technology Inc.

DAW

Decimal Adjust W Register

Syntax:

[ label ] DAW

Operands:

None

Operation:

If [W<3:0> > 9] or [DC = 1] then,

(W<3:0>) + 6

 W<3:0>;

else,

(W<3:0>)

 W<3:0>;

If [W<7:4> 9] or [C = 1] then,

(W<7:4>) + 6

 W<7:4>;

else,

(W<7:4>)

 W<7:4>

Status Affected:

C, DC

Encoding:

0000

0111

Description:

DAW

adjusts the 8-bit value in W,

resulting from the earlier addition of two

variables (each in packed BCD format)

and produces a correct packed BCD

result. The Carry bit may be set by DAW

regardless of its setting prior to the DAW

instruction.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write

Example 1:

DAW

Before Instruction

0xA5

After Instruction

0x05

Example 2:

Before Instruction

0xCE

After Instruction

0x34

DECF

Decrement f

Syntax:

[ label ] DECF f [,d [,a]]

Operands:

 f  255

 [0,1]

Operation:

(f) – 1

 dest

Status Affected:

C, DC, N, OV, Z

Encoding:

0000

01da

ffff

Description:

Decrement register, ‘f’,. If ‘d’ is ‘0’, the

result is stored in W. If ‘d’ is ‘1’, the

result is stored back in register, ‘f’. If ‘a’

is ‘0’, the Access Bank will be selected,

overriding the BSR value. If ‘a’ = 1, then

the bank will be selected as per the

BSR value.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write to

destination

Example:

DECF

CNT,

Before Instruction

CNT

0x01

After Instruction

CNT

0x00

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