PIC12C67X datasheet(76/129 Pages) MICROCHIP

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PIC12C67X

DS30561B-page 76

GOTO

Unconditional Branch

Syntax:

[

label ]

GOTO k

Operands:

≤ k ≤ 2047

Operation:

→ PC<10:0>

PCLATH<4:3>

→ PC<12:11>

Status Affected:

None

Encoding:

1kkk

kkkk

Description:

GOTO

is an unconditional branch.

The eleven bit immediate value is

loaded into PC bits <10:0>. The

upper bits of PC are loaded from

PCLATH<4:3>. GOTO is a two

cycle instruction.

Words:

Cycles:

Example

GOTO THERE

After Instruction

PC =

Address THERE

INCF

Increment f

Syntax:

[

label ]

INCF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) + 1

→ (dest)

Status Affected:

Encoding:

1010

dfff

ffff

Description:

The contents of register ’f’ are

incremented. If ’d’ is 0, the result

is placed in the W register. If ’d’ is

1, the result is placed back in reg-

ister ’f’.

Words:

Cycles:

Example

INCF

CNT,

Before Instruction

CNT

0xFF

After Instruction

CNT

0x00

INCFSZ

Increment f, Skip if 0

Syntax:

[

label ]

INCFSZ f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) + 1

→ (dest), skip if result = 0

Status Affected:

None

Encoding:

1111

dfff

ffff

Description:

The contents of register ’f’ are

incremented. If ’d’ is 0, the result

is placed in the W register. If ’d’ is

1, the result is placed back in reg-

ister ’f’.

If the result is 0, the next instruc-

tion, which is already fetched, is

discarded. A NOP is executed

instead making it a two cycle

instruction.

Words:

Cycles:

1(2)

Example

HERE

INCFSZ

CNT,

GOTO

LOOP

CONTINUE •

•

Before Instruction

address HERE

After Instruction

CNT

CNT + 1

if CNT=

address CONTINUE

if CNT

≠

address HERE +1

IORLW

Inclusive OR Literal with W

Syntax:

[

label ]

IORLW k

Operands:

≤ k ≤ 255

Operation:

(W) .OR. k

→ (W)

Status Affected:

Encoding:

1000

kkkk

Description:

The contents of the W register are

OR’ed with the eight bit literal 'k'.

The result is placed in the W reg-

ister.

Words:

Cycles:

Example

IORLW

0x35

Before Instruction

0x9A

After Instruction

0xBF

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