PIC18F010 datasheet(116/176 Pages) MICROCHIP

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PIC18F010/020

DS41142A-page 114

Preliminary

 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

0xA5

After Instruction

WREG

0x05

Example 2:

Before Instruction

WREG

0xCE

After Instruction

WREG

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 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

0x01

After Instruction

CNT

0x00

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