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DP80390 Instructions set details

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3.6.

CJNE

Instruction:

CJNE <dest-byte >, < src-byte >, rel

Function:

Compare and jump if not equal.

Description:

CJNE compares the magnitudes of the first two operands, and

branches if their values are not equal. The branch destination is

computed by adding the signed relative displacement in the last

instruction byte to the PC, after incrementing the PC to the start of the

next instruction. The carry flag is set if the unsigned integer value of

<dest-byte> is less than the unsigned integer value of <src-byte>;

otherwise, the carry is cleared. Neither operand is affected. The first two

operands allow four addressing mode combinations: the accumulator

may be compared with any directly addressed byte or immediate data,

and any indirect RAM location or working register can be compared with

an immediate constant.

3.6.1. CJNE A, DIRECT, REL

Operation:

(PC)

← (PC) + 3

if (A) < > (direct) then

(PC)

← (PC) + relative offset

if (A) < (direct) then

(C)

← 1

else

(C)

← 0

Bytes:

Cycles:

Encoding:

direct address

relative address

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