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參數(shù)資料
| 型號： | P87C766CBP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for PAL/SECAM TV with OSD and VST |
| 中文描述： | 8-BIT, OTPROM, 12 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SDIP-42 |
| 文件頁數(shù)： | 67/92頁 |
| 文件大小： | 382K |
| 代理商： | P87C766CBP |
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1999 Mar 10
67
Philips Semiconductors
Product specification
Microcontrollers for PAL/SECAM TV
with OSD and VST
P8xCx66 family
17.14 OSD vertical debouncing circuit
The HSYNC and VSYNC signals entering the OSD circuit are usually extracted from the horizontal and vertical deflection
units of a television set. The shaping and timing of these signals is therefore related to several external conditions that
all have certain tolerances. The trigger levels of the input circuitry also influence the internal timing of HSYNC and
VSYNC. In the odd field the leading edge of both signals is very close, so jitter on one or both of them may result in
occasionally miscounting the number of lines in a field causing a displayed character to bounce up and down on a line.
To avoid this situation the HSYNC signal is delayed by a number of dot clocks. Because the relationship between HSYNC
and VSYNC is not fully known there are 16 user selectable delays available. The period of the horizontal starting position
plus the HDEL delay cannot exceed the HSYNC period.
17.14.1 H
ORIZONTAL
D
ELAY
R
EGISTER
(HDEL)
Table 76
Horizontal Delay Register (SFR address C6H)
Table 77
Description of HDEL bits
Table 78
Selection of HSYNC delay
7
6
5
4
3
2
1
0
HDEL3
HDEL2
HDEL1
HDEL0
BIT
SYMBOL
HDEL3
HDEL2
HDEL1
HDEL0
DESCRIPTION
7 to 4
3
2
1
0
These 4 bits are reserved.
HSYNC delay.
The state of these 4 bits determines the delay time applied to the
HSYNC signal, see Table 78.
HDEL3
HDEL2
HDEL1
HDEL0
NO. OF DOT
CLOCKS
DELAY TIME AT
5 MHz (
μ
s)
0
6.4
12.8
19.2
25.6
32
38.4
44.8
51.2
57.6
64
70.4
76.8
83.2
89.6
96
DELAY TIME AT
10 MHz (
μ
s)
0
3.2
6.4
9.6
12.8
16
19.2
22.4
25.6
28.8
32
35.2
38.4
41.6
44.8
48
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
32
64
96
128
160
192
224
256
288
320
352
384
416
448
480
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