OPTION_REG datasheet(191/222 Pages) MICROCHIP

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DS22331A-page 191

MCP19111

29.0

INSTRUCTION SET SUMMARY

The MCP19111 instruction set is highly orthogonal and

is comprised of three basic categories:

• Byte-oriented operations

• Bit-oriented operations

• Literal and control operations

Each instruction is a 14-bit word divided into an

opcode, which specifies the instruction type, and one

or more operands, which further specify the operation

of the instruction. The formats for each of the

categories is presented in Figure 29-1, while the

various opcode fields are summarized in Table 29-1.

Table 29-2 lists the instructions recognized by the

MPASMTM assembler.

For byte-oriented instructions, ‘f’ represents a file

designator. The file register designator specifies which

file register is to be used by the instruction.

The destination designator specifies where the result of

the operation is to be placed. If ‘d’ is zero, the result is

placed in the W register. If ‘d’ is one, 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 bit affected by the

operation, while ‘f’ represents the address of the file in

which the bit is located.

For literal and control operations, ‘k’ represents an

8-bit or 11-bit constant, or literal value.

One instruction cycle consists of four oscillator periods;

for an oscillator frequency of 4 MHz, this gives a normal

instruction execution time of 1 µs. 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. When this occurs,

the execution takes two instruction cycles, with the

second cycle executed as a NOP.

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 (RMW)

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

and the result is stored according to either the

instruction or the destination designator ‘d’. A read

operation is performed on a register even if the

instruction writes to that register.

For example, a CLRF

PORTA

instruction will read

PORTGPA, clear all the data bits, then write the result

back to PORTGPA. This example would have the

unintended consequence of clearing the condition that

set the IOCIF flag.

FIGURE 29-1:

GENERAL FORMAT FOR

INSTRUCTIONS

TABLE 29-1:

OPCODE FIELD

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.

Program Counter

Time-Out bit

Carry bit

Digit carry bit

Zero bit

Power-Down bit

Byte-Oriented file register operations

d = 0 for destination W

OPCODE

f (FILE #)

d = 1 for destination f

f = 7-bit file register address

Bit-Oriented file register operations

10 9

7 6

OPCODE

b (BIT #)

f (FILE #)

b = 3-bit bit address

f = 7-bit file register address

Literal and control operations

OPCODE

k (literal)

k = 8-bit immediate value

OPCODE

k (literal)

k = 11-bit immediate value

General

CALL

and GOTO instructions only

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