PIC18F258-ESLASHLSQTP datasheet(294/402 Pages) MICROCHIP

294 / 402 page

PIC18FXX8

DS41159E-page 292

BNOV

Branch if Not Overflow

Syntax:

[

label ] BNOV

Operands:

-128

≤ n ≤ 127

Operation:

if Overflow bit is ‘0’

(PC) + 2 + 2n

→ PC

Status Affected:

None

Encoding:

1110

0101

nnnn

Description:

If the Overflow bit is ‘0’, then the

program will branch.

The 2’s complement number ‘2n’ is

added to the PC. Since the PC will have

incremented to fetch the next instruc-

tion, the new address will be

PC + 2 + 2n. This instruction is then a

two-cycle instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

If Jump:

Decode

Read literal

‘n’

Process

Data

Write to PC

operation

If No Jump:

Decode

Read literal

‘n’

Process

Data

operation

Example:

HERE

BNOV

Jump

Before Instruction

address (HERE)

After Instruction

If Overflow

address (Jump)

If Overflow

address (HERE + 2)

BNZ

Branch if Not Zero

Syntax:

[

label ] BNZ

Operands:

-128

≤ n ≤ 127

Operation:

if Zero bit is ‘0’

(PC) + 2 + 2n

→ PC

Status Affected:

None

Encoding:

1110

0001

nnnn

Description:

If the Zero bit is ‘0’, then the program

will branch.

The 2’s complement number ‘2n’ is

added to the PC. Since the PC will have

incremented to fetch the next instruc-

tion, the new address will be

PC + 2 + 2n. This instruction is then a

two-cycle instruction.

Words:

Cycles:

1(2)

Q Cycle Activity:

If Jump:

Decode

Read literal

‘n’

Process

Data

Write to PC

operation

If No Jump:

Decode

Read literal

‘n’

Process

Data

operation

Example:

HERE

BNZ

Jump

Before Instruction

address (HERE)

After Instruction

If Zero

address (Jump)

If Zero

address (HERE + 2)

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