AT89LP6440 datasheet(148/194 Pages) ATMEL

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148

3706A–MICRO–9/09

AT89LP6440 - Preliminary

22.1.3

CJNE A, @R

i, rel

Function: Compare and Jump if Not Equal

Description: CJNE compares the magnitudes of the Accumulator and indirect RAM location 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 ACC is less than the unsigned integer value of the indirect location; otherwise, the carry is

cleared. Neither operand is affected.

Example: The Accumulator contains 34H. Register 0 contains 78H and 78H contains 56H. The first instruction in the

sequence,

CJNE

A, @R0, NOT_EQ

;

. . . . . .

...... ...... ; ACC = @R0.

NOT_EQ:

REQ_LOW .. ;IF ACC< @R0.

;

. . . . . .

...... ...... ;ACC > @R0.

sets the carry flag and branches to the instruction at label NOT_EQ. By testing the carry flag, the second

instruction determines whether ACC is greater or less than the location pointed to by R0.

Bytes: 2

Cycles: 9

Encoding:

011

rel. address

Operation: CJNE

(PC)

← (PC) + 3

IF (A)

≠ ((R

i))

THEN

(PC)

← (PC) + relative offset

IF (A) < ((R

i))

THEN

(C)

← 1

ELSE

(C)

← 0

22.1.4

CLR M

Function: Clear MAC Accumulator

Description: CLR M clears the 40-bit M register. No flags are affected.

Example: The M registercontains 123456789AH. The following instruction,

CLR M

leaves the M register set to 0000000000H.

Bytes: 2

Cycles: 2

Encoding:

110

010

Operation: JMP

(M)

←0

AT89LP6440 Datasheet(PDF) 148 Page - ATMEL Corporation

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