PIC18F2520-I/ML【PDF 82/151 页】IC PIC MCU FLASH 16KX16 28QFN

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2011-2012 Microchip Technology Inc.

Preliminary

DS41579C-page 349

PIC16(L)F1782/3

29.0 INSTRUCTION SET SUMMARY

Each instruction is a 14-bit word containing the opera-

tion code (opcode) and all required operands. The

opcodes are broken into three broad categories.

Byte Oriented

Bit Oriented

Literal and Control

The literal and control category contains the most var-

ied instruction word format.

Table 29-3 lists the instructions recognized by the

MPASMTM assembler.

All instructions are executed within a single instruction

cycle, with the following exceptions, which may take

two or three cycles:

Subroutine takes two cycles (CALL, CALLW)

Returns from interrupts or subroutines take two

cycles (RETURN, RETLW, RETFIE)

Program branching takes two cycles (GOTO, BRA,

BRW, BTFSS, BTFSC, DECFSZ, INCSFZ)

One additional instruction cycle will be used when

any instruction references an indirect file register

and the file select register is pointing to program

memory.

One instruction cycle consists of 4 oscillator cycles; for

an oscillator frequency of 4 MHz, this gives a nominal

instruction execution rate of 1 MHz.

All instruction examples use the format ‘0xhh’ to

represent a hexadecimal number, where ‘h’ signifies a

hexadecimal digit.

29.1

Read-Modify-Write Operations

Any instruction that specifies a file register as part of

the instruction performs a Read-Modify-Write (R-M-W)

operation. The register is read, the data is modified,

and the result is stored according to either the instruc-

tion, or the destination designator ‘d’. A read operation

is performed on a register even if the instruction writes

to that register.

TABLE 29-1:

OPCODE FIELD

DESCRIPTIONS

TABLE 29-2:

ABBREVIATION

DESCRIPTIONS

Field

Description

Working register (accumulator)

Bit address within an 8-bit file register

Literal field, constant data or label

Don’t care location (= 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.

Destination select; d = 0: store result in W,

d = 1: store result in file register f.

Default is d = 1.

FSR or INDF number. (0-1)

Pre-post increment-decrement mode

selection

Field

Description

Program Counter

Time-out bit

Carry bit

Digit carry bit

Zero bit

Power-down bit

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