PIC17C752-08SLASHCL datasheet(210/328 Pages) MICROCHIP

210 / 328 page

PIC17C7XX

DS30289A-page 210

DCFSNZ

Decrement f, skip if not 0

Syntax:

[

label] DCFSNZ f,d

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) – 1

→ (dest);

skip if not 0

Status Affected:

None

Encoding:

0010

011d

ffff

Description:

The contents of register 'f' are decre-

mented. If 'd' is 0 the result is placed in

WREG. If 'd' is 1 the result is placed

back in register 'f'.

If the result is not 0, the next instruction,

which is already fetched, is discarded,

and an NOP is executed instead mak-

ing it a two-cycle instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

Process

Data

Write to

destination

If skip:

operation

Example:

HERE

DCFSNZ

TEMP, 1

ZERO

NZERO

Before Instruction

TEMP_VALUE

After Instruction

TEMP_VALUE

TEMP_VALUE - 1,

If TEMP_VALUE

Address (ZERO)

If TEMP_VALUE

≠

Address (NZERO)

GOTO

Unconditional Branch

Syntax:

[

label ]

GOTO k

Operands:

≤ k ≤ 8191

Operation:

→ PC<12:0>;

k<12:8>

→ PCLATH<4:0>,

<15:13> → PCLATH<7:5>

Status Affected:

None

Encoding:

110k

kkkk

Description:

GOTO

allows an unconditional branch

anywhere within an 8K page boundary.

The thirteen bit immediate value is

loaded into PC bits <12:0>. Then the

upper eight bits of PC are loaded into

PCLATH. GOTO is always a two-cycle

instruction.

Words:

Cycles:

Q Cycle Activity:

Decode

Read literal

'k'

Process

Data

Write to PC

operation

Example:

GOTO THERE

After Instruction

PC =

Address (THERE)

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