PIC16C71-04SLASHP datasheet(75/176 Pages) MICROCHIP

75 / 176 page

DS30272A-page 75

PIC16C71X

COMF

Complement f

Syntax:

[

label ] COMF

f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f)

→ (dest)

Status Affected:

Encoding:

1001

dfff

ffff

Description:

The contents of register 'f' are comple-

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

W. If 'd' is 1 the result is stored back in

Words:

Cycles:

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write to

dest

Example

COMF

REG1,0

Before Instruction

REG1

0x13

After Instruction

REG1

0x13

0xEC

DECF

Decrement f

Syntax:

[

label] DECF f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (dest)

Status Affected:

Encoding:

0011

dfff

ffff

Description:

Decrement register 'f'. If 'd' is 0 the

result is stored in the W register. If 'd'

is 1 the result is stored back in register

'f'

Words:

Cycles:

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write to

dest

Example

DECF

CNT, 1

Before Instruction

CNT

0x01

After Instruction

CNT

0x00

DECFSZ

Decrement f, Skip if 0

Syntax:

[

label ] DECFSZ f,d

Operands:

≤ f ≤ 127

∈ [0,1]

Operation:

(f) - 1

→ (dest);

skip if result = 0

Status Affected:

None

Encoding:

1011

dfff

ffff

Description:

The contents of register 'f' are decre-

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

the W register. If 'd' is 1 the result is

placed back in register 'f'.

If the result is 1, the next instruction, is

executed. If the result is 0, then a NOP is

executed instead making it a 2TCY

instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

Decode

Read

'f'

Process

data

Write to

dest

If Skip:

(2nd Cycle)

NOP

Example

HERE

DECFSZ

CNT, 1

GOTO

LOOP

CONTINUE

•

Before Instruction

address HERE

After Instruction

CNT

CNT - 1

if CNT =

address CONTINUE

if CNT

≠

address HERE+1

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