PIC18F1220ESLASHSSSQTP datasheet(212/308 Pages) MICROCHIP

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PIC18F1220/1320

DS39605F-page 210

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 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. The

Carry bit may be set by DAW regard-

less 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’ (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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