PIC18F4539-ESLASHMLSQTP datasheet(237/322 Pages) MICROCHIP

237 / 322 page

 2002 Microchip Technology Inc.

Preliminary

DS30485A-page 235

PIC18FXX39

LFSR

Load FSR

Syntax:

[ label ] LFSR f,k

Operands:

≤ f ≤ 2

≤ k ≤ 4095

Operation:

→ FSRf

Status Affected:

None

Encoding:

1110

1111

1110

0000

00ff

k7kkk

k11kkk

kkkk

Description:

The 12-bit literal 'k' is loaded into

the file select register pointed to

by 'f'.

Words:

Cycles:

Q Cycle Activity:

Decode

Read literal

'k' MSB

Process

Data

Write

literal 'k'

MSB to

FSRfH

Decode

Read literal

'k' LSB

Process

Data

Write literal

'k' to FSRfL

Example:

LFSR 2, 0x3AB

After Instruction

FSR2H

0x03

FSR2L

0xAB

MOVF

Move f

Syntax:

[ label ] MOVF f [,d [,a]

Operands:

≤ f ≤ 255

∈ [0,1]

Operation:

→ dest

Status Affected:

N, Z

Encoding:

0101

00da

ffff

Description:

The contents of register 'f' are

moved to a destination dependent

upon the status of ‘d’. If 'd' is 0, the

result is placed in W. If 'd' is 1, the

result is placed back in register 'f'

(default). Location 'f' can be any-

where in the 256 byte bank. If ‘a’ is

0, the Access Bank will be

selected, overriding the BSR value.

If ‘a’ = 1, then the bank will be

selected as per the BSR value

(default).

Words:

Cycles:

Q Cycle Activity:

Decode

Read

Process

Data

Write W

Example:

MOVF

REG, 0, 0

Before Instruction

REG

0x22

0xFF

After Instruction

REG

0x22

PIC18F4539-E/MLSQTP Datasheet(PDF) 237 Page - Microchip Technology

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