PIC18F4539-ESLASHMLSQTP datasheet(253/322 Pages) MICROCHIP

253 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 251

PIC18FXX39

TSTFSZ

Test f, skip if 0

Syntax:

[ label ] TSTFSZ f [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

skip if f = 0

Status Affected:

None

Encoding:

0110

011a

ffff

Description:

If 'f' = 0, the next instruction,

fetched during the current instruc-

tion execution, is discarded and a

NOP

is executed, making this a two-

cycle instruction. If ‘a’ is 0, the

Access Bank will be selected, over-

riding the BSR value. If ‘a’ is 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

TSTFSZ

CNT, 1

NZERO

ZERO

Before Instruction

PC = Address (HERE)

After Instruction

If CNT

0x00,

Address (ZERO)

If CNT

≠

0x00,

Address (NZERO)

XORLW

Exclusive OR literal with W

Syntax:

[ label ] XORLW k

Operands:

≤ k ≤ 255

Operation:

(W) .XOR. k

→ W

Status Affected:

N, Z

Encoding:

0000

1010

kkkk

Description:

The contents of W are XORed

with the 8-bit literal 'k'. The result

is placed in W.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

literal 'k'

Process

Data

Write to W

Example:

XORLW 0xAF

Before Instruction

0xB5

After Instruction

0x1A

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