DM163006 datasheet(234/320 Pages) MICROCHIP

234 / 320 page

PIC18C601/801

DS39541A-page 234

Advance Information

 2001 Microchip Technology Inc.

DAW

Decimal Adjust WREG Register

Syntax:

[label] DAW

Operands:

None

Operation:

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

(WREG<3:0>) + 6

→ W<3:0>;

else

(WREG<3:0>)

→ W<3:0>;

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

(WREG<7:4>) + 6

→ WREG<7:4>;

else

(WREG<7:4>)

→ WREG<7:4>;

Status Affected:

Encoding:

0000

0111

Description:

DAW adjusts the eight-bit value in

WREG 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

WREG

Example1:

DAW

Before Instruction

WREG

0A5h

After Instruction

WREG

05h

Example 2:

Before Instruction

WREG

0CEh

After Instruction

WREG

34h

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 WREG. 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’ is 1, 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

01h

After Instruction

CNT

00h

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