PIC18F242 datasheet(232/332 Pages) MICROCHIP

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PIC18FXX2

DS39564C-page 230

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 addi-

tion 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

Example1:

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,

1, 0

Before Instruction

CNT

0x01

After Instruction

CNT

0x00

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