PIC18F258-ESLASHLSQTP datasheet(284/402 Pages) MICROCHIP

284 / 402 page

PIC18FXX8

DS41159E-page 282

TABLE 25-1:

OPCODE FIELD DESCRIPTIONS

Field

Description

RAM access bit:

a = 0: RAM location in Access RAM (BSR register is ignored)

a = 1: RAM bank is specified by BSR register

bbb

Bit address within an 8-bit file register (0 to 7).

BSR

Bank Select Register. Used to select the current RAM bank.

Destination select bit:

d = 0: store result in WREG

d = 1: store result in file register f

dest

Destination either the WREG register or the specified register file location.

8-bit register file address (0x00 to 0xFF).

12-bit register file address (0x000 to 0xFFF). This is the source address.

12-bit register file address (0x000 to 0xFFF). This is the destination address.

Literal field, constant data or label (may be either an 8-bit, 12-bit or a 20-bit value).

label

Label name.

The mode of the TBLPTR register for the table read and table write instructions.

Only used with table read and table write instructions:

No change to register (such as TBLPTR with table reads and writes)

Post-Increment register (such as TBLPTR with table reads and writes)

Post-Decrement register (such as TBLPTR with table reads and writes)

Pre-Increment register (such as TBLPTR with table reads and writes)

The relative address (2’s complement number) for relative branch instructions or the direct address for

Call/Branch and Return instructions.

PRODH

Product of Multiply High Byte.

PRODL

Product of Multiply Low Byte.

Fast Call/Return mode select bit:

s = 0: do not update into/from shadow registers

s = 1: certain registers loaded into/from shadow registers (Fast mode)

Unused or unchanged.

WREG

Working register (accumulator).

Don’t care (0 or 1).

The assembler will generate code with x = 0. It is the recommended form of use for compatibility with all

Microchip software tools.

TBLPTR

21-bit Table Pointer (points to a program memory location).

TABLAT

8-bit Table Latch.

TOS

Top-of-Stack.

Program Counter

PCL

Program Counter Low Byte.

PCH

Program Counter High Byte.

PCLATH

Program Counter High Byte Latch.

PCLATU

Program Counter Upper Byte Latch.

GIE

Global Interrupt Enable bit.

WDT

Watchdog Timer.

Time-out bit.

Power-Down bit.

C, DC, Z, OV, N

ALU status bits: Carry, Digit Carry, Zero, Overflow, Negative.

[

]

Optional.

(

)

Contents.

→

Assigned to.

< >

∈

In the set of.

italics

User defined term (font is courier).

PIC18F258-E/LSQTP Datasheet(PDF) 284 Page - Microchip Technology

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