PIC16F1933-ESLASHP datasheet(339/418 Pages) MICROCHIP

339 / 418 page

Preliminary

DS41364A-page 337

PIC16F193X/LF193X

26.0

INSTRUCTION SET SUMMARY

Each PIC16 instruction is a 14-bit word containing the

operation 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 26-3 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 MSb of the appropriate file select register

is set.

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.

26.1

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 26-1:

OPCODE FIELD

DESCRIPTIONS

TABLE 26-2:

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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