90
3.2.5
Using character string data
Character string data is character data used by basic instructions and application instructions.
The target ranges from the designated character to the NULL code (00
H
) that indicates the end of the character string.
(1) When designated character is the NULL code
One word is used to store the NULL code.
(2) When character string is even
Uses (number of characters/2 + 1) words, and stores character string and NULL code.
For example, if "ABCD" is transferred to D0, the character string ABCD is stored at D0 and D1, and the NULL code is
stored at D2. (The NULL code is stored as the last one word.)
(3) When number of characters is odd
Uses (number of characters/2) words (rounds up decimal fractions) and stores the character string and NULL code.
For example, if "ABCDE" is transferred to devices starting from D0, the character string (ABCDE) and the NULL code are
stored from D0 to D2. (The NULL code is stored into the upper 8 bits of the last one word.)
D
esi
g
nati
o
n
o
f NULL c
od
e
(00
H
)
M0
$
MO
V " "
D0
C
haracter strin
g
d
ata transfer instructi
o
n
D0
NULL
D
esi
g
nati
o
n
o
f a character strin
g
c
o
mp
o
se
d
o
f e
v
en numbers
M0
$
MO
V "
ABCD
"
D0
D0
C
haracter strin
g
d
ata transfer instructi
o
n
4
2
H
44
H
4
1
H
4
3
H
NULL
D1
D2
D
esi
g
nati
o
n
o
f a character strin
g
c
o
mp
o
se
d
o
f
odd
numbers
M0
$
MO
V "
ABCD
E"
D0
D0
C
haracter strin
g
d
ata transfer instructi
o
n
4
2
H
44
H
4
1
H
4
3
H
NULL
D1
D2
45
H