STC89LE53RC datasheet(58/165 Pages) STC

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JNC

rel

Function:

Jump if Carry not set

Description:

If the carry flag is a zero, branch to the address indicated; otherwise proceed with the next

instruction. The branch destination is computed by adding the signed relative-displacement

in the second instruction byte to the PC, after incrementing the PC twice to point to the next

instruction. The carry flag is not modified

Example:

The carry flag is set. The instruction sequence,

JNC LABEL1

CPL C

JNC LABEL2

will clear the carry and cause program execution to continue at the instruction identified by

the label LABEL2.

Bytes:

Cycles:

Encoding:

0 1 0 1

0 0 0 0

rel. address

Operation:

JNC

(PC) ← (PC)+ 2

← (PC)+ 2

(PC)+ 2

IF (C) = 0

THEN

(PC) ← (PC) + rel

← (PC) + rel

(PC) + rel

JNZ

rel

Function:

Jump if Accumulator Not Zero

Description:

If any bit of the Accumulator is a one, branch to the indicated address; otherwise proceed

with the next instruction. The branch destination is computed by adding the signed relative-

displacement in the second instruction byte to the PC, after incrementing the PC twice. The

Accumulator is not modified. No flags are affected.

Example:

The Accumulator originally holds 00H. The instruction sequence,

JNZ

LABEL1

INC

JNZ

LAEEL2

will set the Accumulator to 01H and continue at label LABEL2.

Bytes:

Cycles:

Encoding:

0 1 1 1

0 0 0 0

rel. address

Operation:

JNZ

(PC) ← (PC)+ 2

← (PC)+ 2

(PC)+ 2

IF (A) ≠ 0

THEN

(PC) ← (PC) + rel

← (PC) + rel

(PC) + rel

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