Data Register (D) - Mitsubishi Electric L02SCPU User's Manual And Reference

5.2.12

Data register (D)

The data register (D) is a memory in which numeric data (-32768 to 32767, or 0000
(1) Bit structure of the file register
(a) Bit structure and read/write unit
One point of the data register consists of 16 bits, and data can be read or written in units of 16 bits.
Data register area handled as signed data. In the case of the hexadecimal notation, 0000
However, because the most significant bit represents a sign bit, decimal values that can be specified are -32768 to 32767.
(b) Using in a 32-bit instruction
For a 32-bit instruction, two consecutive points of the data register (D
processing. The lower 16 bits correspond to the data register number (D
higher 16 bits correspond to the specified data register number + 1.
Ex. When D12 is specified in the DMOV instruction, D12 represents the lower 16 bits and D13 represents the
higher 16 bits.
Data of -2147483648 to 2147483647 or 00000000
data register. (The most significant bit in a 32-bit structure is a sign bit.)
(2) Retention of stored data
The data stored in the data register are held until other different data are stored. Note that the stored data are
initialized when the CPU module is powered off or reset.
b15
Dn
The most significant bit is a sign bit.
H
to
b0
and D
n
) specified in the program, and the
n
Processing target: D12, D13
D13 D12
Upper 16 bits Lower 16 bits
to FFFFFFFF can be stored in a two-point area of the
H H
CHAPTER 5 DEVICES
to FFFF ) can be stored.
H
to FFFF can be stored.
H H
) are the target of the
n+1
311
5