Link Register (W) - Mitsubishi L02CPU User Manual

5.2.13

Link register (W)

The link register data register whose device number is represented in hexadecimal. In the link register, numeric
data (-32768 to 32767, or 0000
(1) Bit structure of the file register
(a) Bit structure and write/read unit
One point of the link register consists of 16 bits, and data can be written or read in units of 16 bits.
Link register data are 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 (W
processing. The lower 16 bits correspond to the link register number (W
higher 16 bits correspond to the specified link register number + 1.
When W12 is specified in the DMOV instruction, W12 represents the lower 16 bits and D13 represents the
Ex. Ex.
higher 16 bits.
Data of -2147483648 to 2147483647 or 00000000
register. (The most significant bit in a 32-bit structure is a sign bit.)
(2) Retention of stored data
The data stored in the link 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.
248
to FFFF ) are stored.
H H
b15
Wn
The most significant bit is a sign bit.
to
and W
n
) specified in the program, and the
n
Processing target: W12, W13
W13 W12
Upper 16 bits Lower 16 bits
to FFFFFFFF can be stored in a two-point area of the link
H H
b0
to FFFF can be stored.
H H
)are the target of the
n+1