参数资料
型号: ST72T774S9T1
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP44
封装: TQFP-44
文件页数: 105/144页
文件大小: 1280K
代理商: ST72T774S9T1
ST72774/ST727754/ST72734
63/144
SYNC PROCESSOR (SYNC) (Cont’d)
4.4.6.5 Example of VSYNCO extraction for a
negative composite sync with serration pulses
Refer to Figure 43.
In extraction mode, the 5-bit comparator checks
the counter value with respect to the threshold.
When the incoming signal is high, the counter is
increased, otherwise it is decreased.
When the counter reaches the threshold on its way
down, VSYNCO is asserted. During the vertical
blanking, the counter value is decreased down to a
programmable minimum, i.e. it does not underflow.
When the vertical period is finished, the counter
starts counting up and when the maximum is
reached, VSYNCO is negated. The extracted
signal may be validated by software since it is input
to Timer ICAP1.
Serration pulses during vertical blanking can be
filtered if the serration pulse widths are less than
8s.
In the same way, positive composite sync signals
can be used by properly selecting the edge
sensitivity in HSYNCI width measurement mode
(LCV0 bit).
Figure 43. VSYNCO Extraction from a Composite Signal (negative polarity)
Figure 44. Obtaining the 11-bit Vertical Period (V11BITS)
VR01990
8s
Composite signal
Input
Max Pulse width: 8s
1F-Threshold
Counter value:
1F=Max
Serration pulses
VSYNCO Pulse
Max Delay: 8s
or threshold
HSYNCO
Threshold
0=Min
VSYNCO
generated
7
0
10
VGENR
CFGR
V11BITS
Example:
VGENR=CCh, CFGR = 3h
V11bits=663h
Q’2 Q’1 Q’0
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