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4
4 Instructions 4.4.1 Four Arithmetic Operations
DEC: Binary number decremented by 1
◆
Overview
The DEC instruction decrements a binary number by 1.
DEC D
Binary number
decremented by 1
Applicable model:
H3U
D ive result
Address of the word element that stores the regressive
result
16-bit instruction
(3 steps)
DEC: Continuous
execution
DECP: Pulse
execution
32-bit instruction
(5 steps)
DDEC:
Continuous
execution
DDECP: Pulse
execution
◆
Operands
Operand
Bit Element Word Element
System·User System·User Bit Designation Indexed Address Constant
Real
Number
D X Y M T C S SM D R T C SD KnX KnY KnM KnS KnSM
V,Z
Modication K H E
Note: The elements in gray background are supported.
◆
Function
On every execution of the DEC instruction, D has its current value decremented by a value of 1.
In 16-bit operation, 32,767 is reached after –32,768 is decremented by a value of 1. In 32-bit operation,
2,147,483,647 is reached after –2,147,483,648 is decremented by a value of 1.
This instruction does not refresh the zero ag, carry ag, and borrow ag.
In 32-bit operation, the D variable address in this instruction contains the lower 16 bits, and the adjacent
high-numbered address unit contains the higher 16 bits. Avoid repeated or overlapping addresses during
programming.
Example:
M5
ǒDECP D10Ǔ
The value in D10 is decremented
by 1 each time M5 is set.
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