AT89LP6440 datasheet(149/194 Pages) ATMEL

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3706A–MICRO–9/09

AT89LP6440 - Preliminary

22.1.5

INC /DPTR

Function: Increment Alternate Data Pointer

Description: INC /DPTR increments the unselected 16-bit data pointer by 1. A 16-bit increment (modulo 216 ) is performed,

and an overflow of the low-order byte of the data pointer from 0FFH to 00H increments the high-order byte. No

flags are affected.

Example: Registers DP1H and DP1L contain 12H and 0FEH, respectively, and DPS = 0. The following instruction

sequence,

INC

/DPTR

INC

/DPTR

INC

/DPTR

changes DP1H and DP1L to 13H and 01H.

Bytes: 2

Cycles: 3

Encoding:

010

001

Operation: INC

IF (DPS) = 0

THEN

(DPTR1)

← (DPTR1) + 1

ELSE

(DPTR0)

← (DPTR0) + 1

22.1.6

JMP @A+PC

Function: Jump indirect relative to PC

Description: JMP @A+PC adds the eight-bit unsigned contents of the Accumulator to the program counter, which is first

incremented by two. This is the address for subsequent instruction fetches. Sixteen-bit addition is performed

(modulo 216): a carry-out from the low-order eight bits propagates through the higher-order bits. The

Accumulator is not altered. No flags are affected.

Example: An even number from 0 to 6 is in the Accumulator. The following sequence of instructions branches to one of four

AJMP instructions in a jump table starting at JMP_TBL.

JMP

@A + PC

JMP_TBL:

AJMP LABEL0

AJMP LABEL1

AJMP LABEL2

AJMP LABEL3

If the Accumulator equals 04H when starting this sequence, execution jumps to label LABEL2. Because AJMP is

a 2-byte instruction, the jump instructions start at every other address.

Bytes: 2

Cycles: 3

Encoding:

111

001

Operation: JMP

(PC)

←(A) + (PC) + 2

AT89LP6440 Datasheet(PDF) 149 Page - ATMEL Corporation

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