STC89C53RC datasheet(55/165 Pages) STC

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INC

@Ri

Bytes:

Cycles:

Encoding:

0 0 0 0

0 1 1 i

Operation:

INC

((Ri))←((Ri)) + 1

←((Ri)) + 1

((Ri)) + 1

INC

DPTR

Function:

Increment Data Pointer

Description:

Increment the 16-bit data pointer by 1. A 16-bit increment (modulo 216) is performed; an

overflow of the low-order byte of the data pointer (DPL) from 0FFH to 00H will increment

the high-order-byte (DPH). No flags are affected.

This is the only 16-bit register which can be incremented.

Example:

INC DPTR

will change DPH and DPL to 13H and 01H.

Bytes:

Cycles:

Encoding:

1 0 1 0

0 0 1 1

Operation:

INC

(DPTR) ← (DPTR)+1

← (DPTR)+1

bit, rel

Function:

Jump if Bit set

Description:

If the indicated bit is a one, jump to the address indicated; otherwise proceed with the next

instruction. The branch destination is computed by adding the signed relative-displacement

in the third instruction byte to the PC, after incrementing the PC to the first byte of the next

instruction. The bit tested is not modified. No flags are affected.

Example:

The data present at input port 1 is 11001010B. The Accumulator holds 56 (01010110B). The

instruction sequence,

P1.2, LABEL1

ACC.2, LABEL2

will cause program execution to branch to the instruction at label LABEL2.

Bytes:

Cycles:

Encoding:

0 0 1 0

0 0 0 0

bit address

rel. address

Operation:

(PC) ← (PC)+ 3

← (PC)+ 3

(PC)+ 3

IF (bit) = 1

THEN

(PC) ← (PC) + rel

← (PC) + rel

(PC) + rel

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