STC89LE53RC datasheet(46/165 Pages) STC

46 / 165 page

ANL C, /bit

Bytes:

Cycles:

Encoding:

1 0 1 1

0 0 0 0

bit address

Operation:

ADD

(C)←(C)

←(C)

(C)

(bit)

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.

Example:

The Accumulator contains 34H. Register 7 contains 56H. The first instruction in the sequence

CJNE

R7,#60H, NOT-EQ

;

. . .

. . . . . .

; R7 = 60H.

NOT_EQ:

REQ_LOW

; IF R7 < 60H.

;

. . .

. . . . .

; R7 > 60H.

sets the carry flag and branches to the instruction at label NOT-EQ. By testing the carry flag,

this instruction determines whether R7 is greater or less than 60H.

If the data being presented to Port 1 is also 34H, then the instruction,

WAIT: CJNE A,P1,WAIT

clears the carry flag and continues with the next instruction in sequence, since the

Accumulator does equal the data read from P1. (If some other value was being input on Pl,

the program will loop at this point until the P1 data changes to 34H.)

CJNE A,direct,rel

Bytes:

Cycles:

Encoding:

1 0 1 1

0 1 0 1

direct address

rel. address

Operation:

(PC) ← (PC) + 3

← (PC) + 3

(PC) + 3

IF (A) < > (direct)

THEN

(PC) ← (PC) +

← (PC) +

(PC) + relative offset

IF (A) < (direct)

THEN

← 11

ELSE

← 00

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