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DP80390 Datasheet(PDF) 37 Page - Digital Core Design

Part # DP80390
Description  Pipelined High Performance Microcontroller Instructions set details ver 3.10
PDF  84 Pages
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Manufacturer  DCD [Digital Core Design]
Direct Link  http://www.digitalcoredesign.com
Logo DCD - Digital Core Design

DP80390 Datasheet(HTML) 37 Page - Digital Core Design

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DP80390 Instructions set details
- 37 -
All trademarks mentioned in this document
http://www.DigitalCoreDesign.com
are trademarks of their respective owners.
http://www.dcd.pl
Copyright 1999-2003 DCD – Digital Core Design. All Rights Reserved.
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:
2
Cycles:
4
Encoding:
1
1
0
1
1
r
r
r
relative address



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