ST92185B datasheet(124/178 Pages) STMICROELECTRONICS

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ST92185B - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

NATIONAL CHARACTER SET REGISTER

(NCSR)

R245 - Read/Write

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-

cency or Half-Tone realtime control signal is

routed in the TSLU/HT pin (depending on the

HTC bit in the FSCCR register).

Note: Translucent display depends also on the

BE, TIO and MM bits, see Table 11.

Bit 6 = Reserved.

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.

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

sub-sets,

– 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.

Bit 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

TSLE

SWE

NCM

NC3

NC2

NC1

NC0

NCM

SWE

NC[3:0]

G0-0

G0-1

G0-2

G0-0

G0-1

G0-2

G0-0

G0-1

G0-2

SERIAL ATTR. 1Bh

NC[1:0]

NC[3:2]

NC[1:0]

TOGGLE

NS0

NS1

NS14

15 NATIONAL

CHAR. SETS

3 G0 SETS

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