ST92185B STMicroelectronics, ST92185B Datasheet - Page 117

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ON SCREEN DISPLAY (Cont’d)
7.4.7 Font Mapping
G0 is the basic character font.
G1 is the mosaic font. It is not stored in ROM but is
implemented in hardware. In serial mode it is ad-
dressed by a serial attribute (See
allel mode it is accessed by bit 0 (CSS) of the par-
allel shape attribute and bit 1 (US) for separated
mosaic (See
G2 is a font of X/26 based + Menu shared charac-
ters.
An Extended Menu character font available in par-
allel mode. It is accessed via bit 0 (CSS) in the par-
allel shape attribute (Character Set Selection).
The Extended Menu font is not accessible in serial
mode.
7.4.8 Font Mapping Modes
There are two font mapping modes selected
by the NCM bit in the NCSR register R245 (F5h)
Page 32:
Triple G0 mode
Single G0 mode
A set combining 83 characters from
the G0 basic set plus 13 characters
selected from 15 National character
subsets. The National character sub-
sets are selected by four bits (NC3:0)
in the NCSR register R245 (F5h)
Page 32.
Three 96-character character sets
(G0-0, G0-1 and G0-2) for multi al-
phabet applications. Character set
selection is done by four bits (NC1:0
or NC3:2) in the NCSR register R245
(F5h) Page 32.
Figure
4).
Figure
3). In par-
– In Serial Mode (Level 1), only 256 Character
– In Parallel Mode (Enhanced Level 1), 512 Char-
Display ROM Font Entry:
The user must define his own fonts for:
– 278 characters: - 15 x 13 G0 National Character
or
– 288 characters: 3 x 96-character character sets
– 128 G2 based X/26 and Menu characters
– 96 Extended Menu characters
Table 21. Triple G0 Mode - Font Mapping
1C0h to 1FFh 0A0h to 0DFh
080h to 0FFh 080h to 0FFh
160h to 1BFh 020h to 07Fh
ST92185B - ON SCREEN DISPLAY (OSD)
000h to 01Fh 0E0h to 0FFh
020h to 07Fh 020h to 07Fh
100h to 15Fh 020h to 07Fh
Codes are available using an 8-bit code. The
character codes plus some serial attributes and
some additional programmable options address
566 chars: 256 + 182 NS chars + 128 mosaics in
single G0 mode.
acter Codes are available using a 9-bit code. The
character codes plus some serial and parallel at-
tributes, and some additional programmable op-
tions address 662 chars: 256 + 182 NS chars +
128 mosaic + 96 extended chars. in single G0
mode.
subsets + 83 G0 Character set
Address
ROM
Character
Code
(or serial
mode)
CSS
1
0
1
Extended menu
Extended menu
Font Usage
G2 + Menu
G0 set 0
G0 set 1
G0 set 2
117/178