STC89LE53RC datasheet(51/165 Pages) STC

Il numero della parte	STC89LE53RC

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

PDF	165 Pages

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Produttore elettronici	STC [STCmicro Technology Co,.Ltd]

Homepage	http://www.stcmicro.com/

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51 / 165 page

Bytes:

Cycles:

Encoding:

1 1 0 1

0 1 0 0

Operation:

-contents of Accumulator are BCD

[[(A

3-0) > 9] V [(AC) = 1]]

THEN(A

3-0) ← (A

← (A

3-0) + 6

AND

[[(A

7-4) > 9] V [(C) = 1]]

THEN (A

7-4) ← (A

← (A

7-4) + 6

DEC byte

Function:

Decrement

Description:

The variable indicated is decremented by 1. An original value of 00H will underflow to

0FFH.

No flags are affected. Four operand addressing modes are allowed: accumulator, register,

direct, or register-indirect.

Note: When this instruction is used to modify an output port, the value used as the original

port data will be read from the output data latch, not the input pins.

Example:

and 40H, respectively. The instruction sequence,

DEC @R0

DEC

DEC @R0

will leave register 0 set to 7EH and internal RAM locations 7EH and 7FH set to 0FFH and

3FH.

DEC

Bytes:

Cycles:

Encoding:

0 0 0 1

0 1 0 0

Operation:

DEC

(A)←(A)

←(A)

(A)

DEC

Bytes:

Cycles:

Encoding:

0 0 0 1

1 r r r

Operation:

DEC

(Rn)←(Rn) - 1

←(Rn) - 1

(Rn) - 1

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