參數(shù)資料
型號： P87C055BBP
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Microcontrollers for TV and video MTV
中文描述： 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP42
封裝： 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42
文件頁數(shù)： 18/40頁
文件大?。?/td> 243K
代理商： P87C055BBP
1996 Mar 22
18
Philips Semiconductors
Product specification
Microcontrollers for TV and video (MTV)
83C145; 83C845
83C055; 87C055
13.4
Character Generator ROM
Character Generator ROM. Containing 60 displayable bit
maps, i.e. 64 minus 4, comprising:
One for each of new line: New Line, and
Three space characters:
– Space
– BSpace
– SplitBSpace.
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.
13.5
Display RAM organization
Each Display RAM location includes:
6 data bits, and
4 attribute bits.
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.
Fig.7 OSD block diagram.
dbook, full pagewidth
MBG323
CHARACTER
GENERATOR
ADDRESS LOGIC
6
CHARACTER
GENERATOR
60
×
18
×
14
RGB
DIGITAL
VIDEO OUT
OSD RAM
128
×
10
ATTRIBUTE
CONTROL
6
4
7
OSD LOGIC
HSYNC
VSYNC
VCLK2
VCLK1
7
internal
bus
VCTRL
VID2
VID0
VID1
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