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DP80390 Fiches technique(PDF) 34 Page - Digital Core Design

No de pièce DP80390
Description  Pipelined High Performance Microcontroller Instructions set details ver 3.10
PDF  84 Pages
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Fabricant  DCD [Digital Core Design]
Site Internet  http://www.digitalcoredesign.com
Logo DCD - Digital Core Design

DP80390 Fiches technique(HTML) 34 Page - Digital Core Design

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DP80390 Instructions set details
- 34 -
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.
3.10.
DEC
Instruction:
DEC byte
Function:
Decrement byte
Description:
The variable indicated is decremented by 1. An original value of 00 H
will underflow to 0FF H. 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.
3.10.1.
DEC A
Operation:
(PC)
← (PC) + 1
(A)
← (A) - 1
Bytes:
1
Cycles:
1
Encoding:
0
0
0
1
0
1
0
0
3.10.2.
DEC RN
Operation:
(PC)
← (PC) + 1
(Rn)
← (Rn) - 1
Bytes:
1
Cycles:
2
Encoding:
0
0
0
1
1
r
r
r



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