ST92195C STMicroelectronics, ST92195C Datasheet - Page 128

• Manufacturer Part Number: ST92195C
• Description: 48-96 Kbyte Rom Hcmos Mcu With On-screen Display And Teletext Data Slicer
• Manufacturer: STMicroelectronics

ON SCREEN DISPLAY (Cont’d)
NATIONAL CHARACTER SET REGISTER
(NCSR)
R245 - Read/Write
Register Page: 32
Reset Value: 0000 0000 (00h)
The register bit values are sampled and then acti-
vated only at each field start (on Vsync pulse).
Bit 7 = TSLE: Translucency/Half-Tone Output En-
able bit.
0: Translucency/Half-Tone signal disabled
1: Translucency/Half-Tone is enabled. Translu-
Note: Translucent display depends also on the
BE, TIO and MM bits, see
Translucency
Bit 6 = FRSW: Font ROM Switch bit.
This bit allows to switch from the first Font ROM
set to the second one.
0: When the FRSW bit is reset, the first set of 512
1: When the FRSW bit is set, the second set of 512
Bit 5 = SWE: G0 Switch Enable Control Bit .
In case of a multiple G0 alphabet configuration
(NCM=1), this bit allows to switch from a first to a
second predefined G0 alphabet, using a single se-
rial attribute (1Bh). In case of a single G0 alphabet
configuration (NCM=0), the SWE bit will have no
effect.
If SWE is reset, the used G0 alphabet is pointed
through NC[1:0].
If SWE is set, the used G0 alphabet is pointed
through NC[3:2] and NC[1:0] toggled by 1Bh serial
attribute.
TSLE FRSW SWE
cency or Half-Tone realtime control signal is
routed in the TSLU/HT pin (depending on the
HTC bit in the FSCCR register).
ROM characters (FROM 0) is selected.
ROM characters (FROM1) is selected.
7
Configurations.
NCM
NC3
Table 28 Box Mode/
NC2
NC1
NC0
0
ST92195C/D - ON SCREEN DISPLAY (OSD)
Bit 4 = NCM: National Character Mode control bit.
This bit reconfigures a part of the font set as defin-
ing:
– either a single G0 alphabet with up to 15 national
– or 3 different G0 alphabets.
If NCM is reset, a single G0 alphabet configuration
is activated and the 15 national sub-sets are se-
lected through the NC[3:0] bits.
If NCM is set, a triple G0 alphabet configuration is
activated, the selection of the G0 set used for the
display is done through either NC[3:2] or NC[1:0]
bits, depending upon the SWE control bit and the
serial attribute 1Bh values.
Bits 3:0 = NC[3:0]: National Character Set Selec-
tion .
If the NCM bit is reset, these bits define which na-
tional sub-set has to be used to complete the basic
currently used G0 alphabet set.
If the NCM is set, these bits define which G0 is
used.
Figure 81. National Characters Selection
15 NATIONAL
CHAR. SETS
sub-sets,
NC[3:0]
NS14
NS0
NS1
0
NCM
3 G0 SETS
NC[1:0]
1
0
G0-0
G0-1
G0-2
SWE
NC[1:0]
SERIAL ATTR. 1Bh
G0-0
G0-1
G0-2
1
TOGGLE
NC[3:2]
128/249
G0-0
G0-1
G0-2