83C055 Philips Semiconductors, 83C055 Datasheet - Page 18

• Manufacturer Part Number: 83C055
• Description: Microcontrollers for TV and video MTV
• Manufacturer: Philips Semiconductors

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Philips Semiconductors
13.4
Character Generator ROM. Containing 60 displayable bit
maps, i.e. 64 minus 4, comprising:
Each bit map includes 18 scan lines by 14 dots.
The Character Generator ROM is maskable or
programmable along with the Program ROM to allow for
various character sets and languages.
1996 Mar 22
One for each of new line: New Line, and
Three space characters:
– Space
– BSpace
– SplitBSpace.
Microcontrollers for TV and video (MTV)
Character Generator ROM
internal
HSYNC
bus
VSYNC
7
ADDRESS LOGIC
GENERATOR
CHARACTER
OSD RAM
128
10
7
6
Fig.7 OSD block diagram.
OSD LOGIC
4
6
18
GENERATOR
CHARACTER
ATTRIBUTE
60
CONTROL
13.5
Each Display RAM location includes:
The 6 data bits from Display RAM, along with a
line-within-row count, act as addresses into the Character
Generator ROM. Except in special test modes that are
beyond the scope of this data sheet, Display RAM cannot
be read by the MCU program.
18
6 data bits, and
4 attribute bits.
14
Display RAM organization
VCLK2
VCLK1
VIDEO OUT
DIGITAL
RGB
MBG323
83C145; 83C845
83C055; 87C055
VCTRL
VID2
VID1
VID0
Product specification