AT89LP6440 datasheet(143/194 Pages) ATMEL

143 / 194 page

143

3706A–MICRO–9/09

AT89LP6440 - Preliminary

22. Instruction Set Summary

The AT89LP6440 is fully binary compatible with the 8051 instruction set. The difference

between the AT89LP6440 and the standard 8051 is the number of cycles required to execute an

instruction. Instructions in the AT89LP6440 may take 1 to 9 clock cycles to complete. The exe-

cution times of most instructions may be computed using Table 22-1.

Table 22-1.

Instruction Execution Times and Exceptions

Generic Instruction Types

Cycle Count Formula

Most arithmetic, logical, bit and transfer instructions

# bytes

Branches and Calls

# bytes + 1

Single Byte Indirect (i.e. ADD A, @Ri, etc.)

RET, RETI

4/5

(4)

MOVC

MOVX

2/4(2)

MUL

DIV

MAC

INC DPTR

Arithmetic

Bytes

Clock Cycles

Hex Code

8051

AT89LP

ADD A, Rn

28-2F

ADD A, direct

ADD A, @Ri

26-27

ADD A, #data

212

ADDC A, Rn

38-3F

ADDC A, direct

ADDC A, @Ri

36-37

ADDC A, #data

212

SUBB A, Rn

98-9F

SUBB A, direct

SUBB A, @Ri

96-97

SUBB A, #data

212

INC Rn

08-0F

INC direct

INC @Ri

06-07

INC A

DEC Rn

18-1F

DEC direct

DEC @Ri

16-17

DEC A

INC DPTR

AT89LP6440 Datasheet(PDF) 143 Page - ATMEL Corporation

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