PIC18F258-ESLASHLSQTP datasheet(302/402 Pages) MICROCHIP

302 / 402 page

PIC18FXX8

DS41159E-page 300

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:

Encoding:

0000

0111

Description:

DAW

adjusts the eight-bit value in W

resulting from the earlier addition of two

variables (each in packed BCD format)

and produces a correct packed BCD

result.

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’

(default). 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 (default).

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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