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參數(shù)資料
| 型號： | MC141541P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 畫面疊加 |
| 英文描述： | Fixed-Point Digital Signal Processor 570-FCPGA -40 to 105 |
| 中文描述： | ON-SCREEN DISPLAY IC, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 361K |
| 代理商： | MC141541P |
MC141541
10
MOTOROLA
Table 2. Resolution Setting
Register Setting (32B)
0
1
Dot Number per H Sync Line
320
Bordering
0
15
14
12
11
10
6
4
2
15
Shadowing
6
14
8
4
0
1
13
12
11
10
9
7
5
3
2
Figure 11. Character Bordering and Shadowing
Frame Format and Timing
Figure 12 illustrates the positions of all display characters
on the screen relative to the leading edge of horizontal and
vertical flyback signals. The shaded area indicates the area
outside the “safe viewing area” for the display characters.
Notice that there are two components in the equations stated
in Figure 12 for horizontal and vertical delays: fixed delays
from the leading edge of HFLB and VFLB signals, regardless
of the values of HORD and VERTD (47 dots + phase detec-
tion pulse width) and one H scan line for horizontal and verti-
cal delays, respectively; and variable delays determined by
the values of HORD and VERTD. Refer to
Frame Control
Registers Coln 9 and 10
for the definitions of VERTD and
HORD.
Phase detection pulse width is a function of the external
charge–up resistor, which is the 330 k
resistor in a series
with 2 k
to VCO pin in the Application Diagram. Dot fre-
quency is determined by the equation H freq x 320if Bit
X32B is clear, and H freq x 480if Bit X32B is set to 1 and Bit
X64 is 0. For example, dot frequency is 10.24 MHz if H freq is
32 kHz while Bit X32B is 0. If Bit X32B is 1 and Bit X64 is 0,
the dot frequency will be 15.36 MHz (one and a half of the
original one).
When double character width is selected for a row, only the
even–numbered characters will be displayed, as shown in
Row 2. Notice that the total number of horizontal scan lines in
the display frame is variable, depending on the chosen char-
acter height of each row. Care should be taken while config-
uring each row character height so that the last horizontal
scan line in the display frame always comes out before the
leading edge of VFLB of the next frame, to avoid wrapping
display characters of the last few rows in the current frame
into the next frame. The number of display dots in a horizon-
tal scan line is always fixed at 240, regardless of row charac-
ter width and the setting of Bit X32B.
1
2
3
4
5
0
VFLB
H
R
C
6
2
3
2
2
2
d
d
C
C
&
s
&
c
c
c
c
c
c
1
variable number of H scan lines
vertical delay =
VERTD x 4 + 1 H scan lines
h
D
a
d
.
H
Figure 12. Display Frame Format
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