NEC PD17062 - Manual (Page 258)

258
µ
PD17062
20.5.2 Control Data
The control data specifies the display position, size, and color of a character pattern. It is stored at
×××
FH
in the CROM area. One control data item consists of 16 bits. The highest bit is always 0. Fig. 20-9 shows
the configuration of the control data.
Fig. 20-9 Control Data Configuration
The control data is provided between two character pattern data items. It has nothing to do with the
character pattern data items at addresses before and after the control code. Any control data can be specified
using data in VRAM.
(1) Horizontal size data (b 14 and b 13 of control data)
The horizontal size data determines the horizontal size of each image of a character. Each character has
four image sizes (up to three sizes per row). Table 20-7 lists details of the horizontal size data.
Table 20-7 Horizontal Size Setting
0
b
15
b
14
b
13
b
12
b
11
b
10
b
9
b
8
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
(Fixed)
Horizontal
size
Vertical
size
Horizontal
position
Vertical
position Color
Horizontal size data
Size
Horizontal width Maximum number of display
b 14 b 13
of a character characters per row
0 0 Standard 2.5
µ
s 16
0 1 Double 5.0
µ
s 8
1 0 Triple 7.5
µ
s 5
1 1 Quadruple 10.0
µ
s 4