STC89LE53RC datasheet(51/165 Pages) STC

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

STC89LE53RC 数据表(PDF) 51 Page - STCmicro Technology Co,.Ltd

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STC89LE53RC 数据表(PDF) 51 Page - STCmicro Technology Co,.Ltd

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