ST92185B STMicroelectronics, ST92185B Datasheet - Page 129

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

ON SCREEN DISPLAY (Cont’d)
DISPLAY
(DCM0R)
R250 - Read/Write
Register Page: 32
Reset Value: 0000 0000 (00h)
Bit 7 = DE: Display Enable control bit .
If DE is reset, no display will be performed. If DE is
set, a display will be done as defined through the
various control bits.
Bit 6 = STE: Semi-Transparent Enable bit .
This bit is active only in Single page display mode.
While the Display is disabled, the horizontal and
vertical sequencers are forced in their reset state
and the RGB & FB DACs are not off (still present-
ing on-chip resistors to Ground).
Note: This mode shows a visible grid on the
screen.
Bit 5 = FRE: Fringe Enable control bit .
If this bit is set, and the SWE bit is reset (refer to
the National Character Set Register description)
the serial attribute 1Bh has a fringe toggle func-
tion.
Bit 4 = CE: Conceal Enable control bit .
0: Reveal any text defined as concealed by serial
FRE
DE
attributes (Default)
7
0
0
1
1
STE
SWE
0
1
0
1
CONTROL MODE
FRE
1Bh Serial attribute acts as:
CE
Fringe Toggle
GFR
G0 Toggle
G0 Toggle
No Action
GRE
0
REGISTER
SF
S/D
0
1: Conceal any text defined as concealed by serial
Bit 3 = GFR: Global Fringe Enable control bit.
If this bit is set, the whole display is in fringe mode
(except if a Double page display mode is pro-
grammed).
Bit 2 = GRE: Global Rounding Enable control bit .
If this bit is set, the whole display is in rounding
mode (except if a Double page display mode is
programmed).
Bit 1 = SF: Screen Format control bit .
0: Configures the Display for 4/3 TV screen format.
1: A fixed offset of 128 Pixel clock periods is added
The SF bit intended for displaying on 16/9 TV
screen format tubes, the display picture will be re-
centered.
Bit 0 = S/D: Single or Double page control bit.
0: A single page is displayed on screen (i.e. 40-
1: A set of two pages is displayed contiguously
Note: In 80 characters per row and in full page
mode, line 25 of each field is displayed as a
transparant line (as this line is not in the visible
part of the screen, this should not present a limita-
tion).
Programming a Double page display will automat-
ically mask the Fringe, Rounding and Parallel
Mode control bits. Their register values are not
changed and they will automatically recover their
initial effect if the display is switched back in a Sin-
gle page mode.
ST92185B - ON SCREEN DISPLAY (OSD)
attributes
before any character is displayed; the Full
Screen Color attribute is used while the offset is
running.
character width).
(i.e. 80-character width).
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