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參數(shù)資料
| 型號(hào)： | P83C880 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | Microcontrollers for monitors with DDC interface, auto-sync detection and sync proc(帶DDC接口，同步監(jiān)測(cè)和同步處理的監(jiān)視器微控制器) |
| 中文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP42 |
| 封裝： | 0.600 INCH, PLASTIC, SOT-270-1, SDIP-42 |
| 文件頁(yè)數(shù)： | 58/84頁(yè) |
| 文件大?。?/td> | 420K |
| 代理商： | P83C880 |
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1997 Dec 12
58
Philips Semiconductors
Product specification
Microcontrollers for monitors with DDC
interface, auto-sync detection and sync proc.
P83Cx80; P87C380
19.2.5
H
ORIZONTAL MODE DETECTION
This function block determines the following 4 parameters: Hper, Hpol, Hpres and Hcha. The functional block diagram is
shown in Fig.29.
The 12-bit counter for the determination of the horizontal period has a synchronous reset and will be reset by the
prescaled and differentiated horizontal pulse HSYNC_P, coming from the horizontal prescaler, or in case the counter
reaches the value FF0H as defined by the comparator. The latter situation will occur if no sync pulses are coming in or
if the frequency of the incoming sync pulses is too low.
The 12-bit register, that will store the 4 line time period, is only enabled if the signal HENA is HIGH.
19.2.5.1
Parameter Hper
Based on this configuration, the resulting accuracy for Hper will be:
Accuracy in H
Table 63
Accuracies
XTAL (f
clk
)
(MHz)
FOSH
(MHz)
ACCURACY IN H AT 30KHZ
(%)
ACCURACY IN V AT 50HZ
(%)
10
12
16
10
12
8
0.075
0.063
0.094
0.038
0.032
0.048
Fig.28 Vertical sync separator.
handbook, full pagewidth
MGG037
8-BIT
COUNTER
E
R
Q7 to Q0
DIFFERENTIATOR
D-FF
D
E
Q
COMPARATOR
FOR
SYNC
SEPARATION
DIV 16
Vsep
HSYNC_P
FOSH
Hper
(horizontal counter value)
=
100%
×
f
H
×
FOSH
4
=
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