RFPIC12C509AF datasheet(59/104 Pages) MICROCHIP

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Preliminary

DS70031A-page 57

rfPIC12C509AG/509AF

9.0

INSTRUCTION SET SUMMARY

Each rfPIC12C509AG/509AF instruction is a 12-bit

word divided into an OPCODE, which specifies the

instruction type, and one or more operands which fur-

ther specify the operation of the instruction. The

rfPIC12C509AG/509AF instruction set summary in

Table 9-2 groups the instructions into byte-oriented, bit-

oriented, and literal and control operations. Table 9-1

shows the opcode field descriptions.

For byte-oriented instructions, 'f' represents a file reg-

ister designator and 'd' represents a destination desig-

nator. The file register designator is used to specify

whichone of the32fileregistersistobeusedby the

instruction.

The destination designator specifies where the result of

the operation is to be placed. If 'd' is '0', the result is

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

in the file register specified in the instruction.

For bit-oriented instructions, 'b' represents a bit field

designator which selects the number of the bit affected

by the operation, while 'f' represents the number of the

file in which the bit is located.

For literal and control operations, 'k' represents an

8 or 9-bit constant or literal value.

TABLE 9-1:

OPCODE FIELD

DESCRIPTIONS

All instructions are executed within a single instruction

cycle, unless a conditional test is true or the program

counter is changed as a result of an instruction. In this

case, the execution takes two instruction cycles. One

instruction cycle consists of four oscillator periods.

Thus, for an oscillator frequency of 4 MHz, the normal

instruction execution time is 1

µs. If a conditional test is

true or the program counter is changed as a result of an

instruction, the instruction execution time is 2

µs.

Figure 9-1 shows the three general formats that the

instructions can have. All examples in the figure use

the following format to represent a hexadecimal num-

ber:

0xhhh

where 'h' signifies a hexadecimal digit.

FIGURE 9-1:

GENERAL FORMAT FOR

INSTRUCTIONS

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 (storeresult inW)

d=1 (storeresult infileregister 'f')

Default is d = 1

label

Label name

TOS

Top of Stack

Program Counter

WDT

Watchdog Timer Counter

Time-Out bit

Power-Down bit

dest

Destination, either the W register or the specified

[]

Options

()

Contents

→

Assigned to

∈

In the set of

italics

User defined term (font is courier)

Byte-oriented file register operations

d = 0 for destination W

OPCODE

f (FILE #)

d = 1 for destination f

f = 5-bit file register address

Bit-oriented file register operations

8 7

5 4

OPCODE

b (BIT #)

f (FILE #)

b = 3-bit bit address

f = 5-bit file register address

Literal and control operations (except GOTO)

OPCODE

k (literal)

k = 8-bit immediate value

Literal and control operations - GOTO instruction

OPCODE

k (literal)

k = 9-bit immediate value

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