STC89LE53RC datasheet(52/165 Pages) STC

Teilenummer	STC89LE53RC

Bauteilbeschribung	Enhanced 80C51 Central Processing Unit ,6T or 12T per machine cycle

PDF	165 Pages

Scroll/Zoom	100%

Hersteller	STC [STCmicro Technology Co,.Ltd]

Direct Link	http://www.stcmicro.com/

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DEC

direct

Bytes:

Cycles:

Encoding:

0 0 0 1

0 1 0 1

direct address

Operation:

DEC

(direct)←(direct)

←(direct)

(direct)

DEC

@Ri

Bytes:

Cycles:

Encoding:

0 0 0 1

0 1 1 i

Operation:

DEC

((Ri))←((Ri)) - 1

←((Ri)) - 1

((Ri)) - 1

DIV AB

Function:

Divide

Description:

DIV AB divides the unsigned eight-bit integer in the Accumulator by the unsigned eight-bit

integer in register B. The Accumulator receives the integer part of the quotient; register B

receives the integer remainder. The carry and OV flags will be cleared.

Exception: if B had originally contained 00H, the values returned in the Accumulator and

B-register will be undefined and the overflow flag will be set. The carry flag is cleared in any

case.

Example:

The Accumulator contains 251(OFBH or 11111011B) and B contains 18(12H or 00010010B).

The instruction,

DIV

will leave 13 in the Accumulator (0DH or 00001101B) and the value 17 (11H or 00010010B)

in B, since 251 = (13×18) + 17. Carry and OV will both be cleared.

Bytes:

Cycles:

Encoding:

1 0 0 0

0 1 0 0

Operation:

DIV

(A)

15-8

(B)

7-0

← (A)/(B)

(A)/(B)

STC89LE53RC Datenblatt(PDF) 52 Page - STCmicro Technology Co,.Ltd

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