Справочник Пользователя для Mitsubishi Electronics QCPU

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3

.2 Designa

ting D

ata

3

.2.5 Using 

char

acte

r string data

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

esignation of NULL code (00

H

)

M0

$MOV "  "

D0

C

haracter string data transfer instruction

D0

NULL

D

esignation of a character string  

composed of even numbers

M0

$MOV "ABCD" D0

D0

C

haracter string data transfer instruction

42

H

44

H

41

H

43

H

NULL

D1

D

2

D

esignation of a character string 

composed of odd numbers

M0

$MOV "ABCDE" D0

D0

C

haracter string data transfer instruction

42

H

44

H

41

H

43

H

NULL

D1

D

2

45

H