PIC18F1220ESLASHSSSQTP datasheet(210/308 Pages) MICROCHIP

210 / 308 page

PIC18F1220/1320

DS39605F-page 208

COMF

Complement f

Syntax:

[ label ] COMF

f [,d [,a]]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f)

→ dest

Status Affected:

N, Z

Encoding:

0001

11da

ffff

Description:

The contents of register ‘f’ are

complemented. 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:

COMF

REG,

Before Instruction

REG

0x13

After Instruction

REG

0x13

0xEC

CPFSEQ

Compare f with W, skip if f = W

Syntax:

[ label ] CPFSEQ

f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

(f) – (W),

skip if (f) = (W)

(unsigned comparison)

Status Affected:

None

Encoding:

0110

001a

ffff

Description:

Compares the contents of data

memory location ‘f’ to the contents

of W by performing an unsigned

subtraction.

If ‘f’ = W

, then the fetched

instruction is discarded and a NOP

is executed instead, making this a

two-cycle instruction. 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:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Decode

Read

Process

Data

operation

If skip:

operation

If skip and followed by 2-word instruction:

operation

Example:

HERE

CPFSEQ REG

NEQUAL

EQUAL

Before Instruction

PC Address

HERE

REG

After Instruction

If REG

Address (EQUAL)

If REG

≠

Address (NEQUAL)

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