PIC17C752 datasheet(196/320 Pages) MICROCHIP

196 / 320 page

PIC17C75X

DS30264A-page 196

CPFSLT

Compare f with WREG,

skip if f < WREG

Syntax:

[

label ] CPFSLT

Operands:

≤ f ≤ 255

Operation:

(f) –

(WREG),

skip if (f) < (WREG)

(unsigned comparison)

Status Affected:

None

Encoding:

0011

0000

ffff

Description:

Compares the contents of data memory

location 'f' to the contents of WREG by

performing an unsigned subtraction.

If the contents of 'f' are less than the

contents of WREG, then the fetched

instruction is discarded and an NOP is

executed instead making this a

two-cycle instruction.

Words:

Cycles:

1 (2)

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

Example:

HERE

CPFSLT REG

NLESS

LESS

Before Instruction

Address (HERE)

After Instruction

If REG

WREG;

Address (LESS)

If REG

≥

WREG;

Address (NLESS)

DAW

Decimal Adjust WREG Register

Syntax:

[

label] DAW

f,s

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

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

WREG<3:0> + 6

→ f<3:0>, s<3:0>;

else

WREG<3:0>

→ f<3:0>, s<3:0>;

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

WREG<7:4> + 6

→ f<7:4>, s<7:4>

else

WREG<7:4>

→ f<7:4>, s<7:4>

Status Affected:

Encoding:

0010

111s

ffff

Description:

DAW adjusts the eight bit value in

WREG resulting from the earlier addi-

tion of two variables (each in packed

BCD format) and produces a correct

packed BCD result.

s = 0:

Result is placed in Data

memory location 'f' and

WREG.

s = 1:

Result is placed in Data

memory location 'f'.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write

and other

speciﬁed

Example1:

DAW

REG1, 0

Before Instruction

WREG

0xA5

REG1

After Instruction

WREG

0x05

REG1

0x05

Example 2:

Before Instruction

WREG

0xCE

REG1

After Instruction

WREG

0x24

REG1

0x24

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