PIC18F258-ESLASHLSQTP datasheet(323/402 Pages) MICROCHIP

323 / 402 page

DS41159E-page 321

PIC18FXX8

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 instruction execution

is discarded and a NOP is executed,

making this a two-cycle instruction. If ‘a’

is ‘0’, the Access Bank will be selected,

overriding 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

NZERO

ZERO

Before Instruction

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

Example:

XORLW

0xAF

Before Instruction

0xB5

After Instruction

0x1A

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