參數(shù)資料
型號(hào): PCA84C646
廠商: NXP Semiconductors N.V.
英文描述: Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述: 微控制器的控制和調(diào)整(應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD)
文件頁(yè)數(shù): 19/72頁(yè)
文件大?。?/td> 564K
代理商: PCA84C646
1995 Jun 15
19
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
10 DISPLAY RAM ORGANIZATION
The display RAM is organized as 64
×
10 bits.
The general format of each RAM location is as follows:
Bits <9-4> hold data, comprising:
– Customer designed Character Font Codes (62)
– Carriage Return Code (1)
– Space Code (1).
Bits <3-0> contain the attributes of the Character Font:
– Foreground colour and Blinking
– Character size and Line space
– Background colour and End-of-Display .
10.1
Description of display RAM codes
There are three data formats for the display RAM code
1.
Character Font Code
2.
Carriage Return Code
3.
Space Code.
The three data formats and their descriptions are shown in
Tables 9 to 17. Figure 14 illustrates an example of the
timing of FB, R, G, and B pulses when displaying a line of
dots stream in a character.
FB = VOB; R = VOW0, G = VOW1; B = VOW2.
Figure 15 shows an example of the screen which includes
some Cariage Return and Space codes.
Table 9
Format of Character Font Code
Table 10
Description of Character Font Code bits
Table 11
Selection of Background and Foreground colour
9
8
7
6
5
4
3
2
1
0
C5
C4
C3
C2
C1
C0
T3
T2
T1
T0
Blink
Character Font Code (00H - 3DH)
Foreground colour
SYMBOL
DESCRIPTION
C5 to C0
If bits <9-4> are in the range (00H to 3DH), then this is a Character Font Code and 1 from 62 customer
designed character fonts can be selected.
Bits <3-1> determine the (Foreground) colour (1 out of 8) of this character; see Table 11.
Blinking of this character is controlled by bit <0>. See Section 12.3 for duty cycle and frequency control.
When T0 = 0; blinking is OFF.
When T0 = 1; blinking is ON. Blinking rate:
1
16
,
1
32, 1
64
or
1
128
×
f
VSYNC
.
T3 to T1
T0
T3
(RED)
T2
(GREEN)
T1
(BLUE)
COLOUR
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
black
blue
green
cyan
red
magenta
yellow
white
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