PIC18F258-I/SP View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18F258-I/SP

28/40-Pin High-Performance, Enhanced Flash Microcontrollers with CAN Module

Microchip Technology 

PIC18FXX8

TSTFSZ

Test f, Skip if 0

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

[ label ] TSTFSZ f [,a]

0 ≤ f ≤ 255

a ∈ [0,1]

skip if f = 0

None

0110 011a ffff ffff

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:

1

Cycles:

1(2)

Note: 3 cycles if skip and followed

by a 2-word instruction.

Q Cycle Activity:

Q1

Q2

Q3

Q4

Decode

If skip:

Q1

Read

register ‘f’

Q2

Process

Data

Q3

No

operation

Q4

No

operation

No

operation

No

operation

If skip and followed by 2-word instruction:

No

operation

Q1

No

operation

Q2

No

operation

Q3

No

operation

Q4

No

operation

No

operation

No

operation

No

operation

No

operation

Example:

HERE TSTFSZ CNT

NZERO :

ZERO :

Before Instruction

PC

=

After Instruction

If CNT

=

PC

=

If CNT

≠

PC

=

Address (HERE)

0x00,

Address (ZERO)

0x00,

Address (NZERO)

XORLW

Syntax:

Operands:

Operation:

Status Affected:

Encoding:

Description:

Words:

Cycles:

Q Cycle Activity:

Q1

Decode

Exclusive OR Literal with W

[ label ] XORLW k

0 ≤ k ≤ 255

(W) .XOR. k → W

N, Z

0000 1010 kkkk kkkk

The contents of W are XORed with

the 8-bit literal ‘k’. The result is placed

in W.

1

1

Q2

Read

literal ‘k’

Q3

Process

Data

Q4

Write to

W

Example:

XORLW 0xAF

Before Instruction

W

=

After Instruction

W

=

0xB5

0x1A

© 2006 Microchip Technology Inc.

DS41159E-page 321

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