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(2) Vertical size data (b
12
The vertical size data determines the vertical size of each image of a character. Up to four sizes can be
specified on each row. Table 20-8 lists details of the vertical size data.
The vertical size data specified at the beginning of a row is effective throughout that row. The vertical
size data in any other control data for the same row is ignored.
Vertical size data
b
b
12
11
0
0
0
1
1
0
1
1
(3) Horizontal position data (b
The horizontal position data specifies which of the 16 horizontal positions shown in Fig. 20-10 the display
is to begin at. Although each row has 19 horizontal display positions, the display can start only at within
16 character positions from the left side of the screen.
The beginning of the row is specified with an absolute column number (column from 0 to 15 in
Fig. 20-10). The horizontal position data consists of four bits of the control data, with b
to the MSB and b
corresponding to the LSB, and therefore it takes a value from 0H to FH. Value 0H
7
corresponds to column 0, and value FH to column 15.
The number of character positions left blank between two characters on the same row is specified by the
horizontal position data. In other words, the position of the next character is specified by the number (in
hexadecimal) of blank character positions after the current character position.
In Fig. 20-10, for example, the horizontal position data of A and that of C are 8H and 1H, respectively. If
the control data of C is changed to 0, C is displayed in column 9 (at character position 9). If no control
data is used after A, C is displayed also in column 9.
Remark The term number of character positions used in the above description applies when the horizontal
size data is 00. If the horizontal size data is changed, the character positions are counted for the
new horizontal size data. If the horizontal size data is a double size, for example, one row has
only eight character positions.
and b
of the control data)
11
Table 20-8 Vertical Size Setting
Vertical width of a
Size
character (interlace)
Standard
15H
Double
30H
Triple
45H
Quadruple
60H
to b
of the control data)
10
7
Maximum number of display
characters in the vertical direction
12
6
4
3
PD17062
corresponding
10
259
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