DP80390 datasheet(37/84 Pages) DCD

Teilenummer	DP80390

Bauteilbeschribung	Pipelined High Performance Microcontroller Instructions set details ver 3.10

PDF	84 Pages

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Hersteller	DCD [Digital Core Design]

Direct Link	http://www.digitalcoredesign.com

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DP80390 Instructions set details

- 37 -

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3.12.

DJNZ

Instruction:

DJNZ <byte>, <rel-addr>

Function:

Decrement and jump if not zero

Description:

DJNZ decrements the location indicated by 1, and branches to the

address indicated by the second operand if the resulting value is not

zero. An original value of 00 H will underflow to 0FF H. No flags are

affected. The branch destination would be computed by adding the

signed relative-displacement value in the last instruction byte to the PC,

after incrementing the PC to the first byte of the following instruction.

The location decremented may be a register or directly addressed byte.

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.

3.12.1.

DJNZ RN, REL

Operation:

(PC)

← (PC) + 2

(Rn)

← (Rn) - 1

if (Rn)

≠ 0 then

(PC)

← (PC) + rel

Bytes:

Cycles:

Encoding:

relative address

DP80390 Datenblatt(PDF) 37 Page - Digital Core Design