PIC18F1220ESLASHSSSQTP datasheet(233/308 Pages) MICROCHIP

233 / 308 page

DS39605F-page 231

PIC18F1220/1320

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 XOR’ed

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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