DM163006 datasheet(257/320 Pages) MICROCHIP

257 / 320 page

 2001 Microchip Technology Inc.

Advance Information

DS39541A-page 257

PIC18C601/801

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 exe-

cution, 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, the Bank will

be selected as per the BSR value.

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

00h,

Address (ZERO)

If CNT

≠

00h,

Address (NZERO)

XORLW

Exclusive OR literal with WREG

Syntax:

[ label ] XORLW k

Operands:

≤ k ≤ 255

Operation:

(WREG) .XOR. k

→ WREG

Status Affected:

N,Z

Encoding:

0000

1010

kkkk

Description:

The contents of WREG are

XOR’ed with the 8-bit literal 'k'. The

result is placed in WREG.

Words:

Cycles:

Q Cycle Activity:

Decode

Read

literal ’k’

Process

Data

Write to

WREG

Example:

XORLW 0AFh

Before Instruction

WREG

0B5h

After Instruction

WREG

1Ah

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