參數(shù)資料
型號： ST72E734J6D0
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, UVPROM, 8 MHz, MICROCONTROLLER, CDIP42
封裝： CERAMIC, SDIP-42
文件頁數(shù)： 106/144頁
文件大?。?/td> 1280K
代理商： ST72E734J6D0
ST72774/ST727754/ST72734
64/144
SYNC PROCESSOR (SYNC) (Cont’d)
4.4.7 Output Processing
4.4.7.1 Generating Free-Running Frequencies
The free-running frequencies function is used to:
– Drive the monitor when no or bad sync signals
are received.
– Stabilize the OSD screen when the monitor is
unlocked.
– Perform fast alignment for maintenance purpos-
es.
Note: When free-running mode is active, the analyzer
and corrector modes must be disabled.
– VCORDIS = 1, VEXT = 0 in CFGR and POLR
registers for vertical output measurement
– 2FHINH = 0 in CFGR register for horizontal
low level measurment
– VACQ, HACQ = 0, in CFGR register for ana-
lyzer mode
The Sync processor can generate any of the
following output sync signals HSYNCO, VSYNCO,
CLAMPOUT, BLANKOUT.
To select the generation mode:
– Program the horizontal period using the HGENR
register.
– Program the vertical period using the VGENR (8
bits) and CFGR (3 bits) registers (2047 scan
lines per frame). Refer to Figure 44.
– Configure the following bits:
SYNOP = 0
HVGEN = 1
HACQ = 0
VACQ = 0
Horizontal Period
PH = Horizontal period = ((HGENR+1)/4) s
Pulse width: 2 s => HGENR min=8
Polarity: Positive
HGENR range: [8..255]
Vertical Period
PV = Vertical period = (PH * V11bits) s
V11bits is a concatenation of VGENR and the Q'2
Q'1 Q'0 bits of the CFGR register.
Refer to Figure 44.
Pulse width: 4 * PH => min value= 8s
Polarity: Positive
VGENR/CFGR range: [5..7FF]
Table 17. Typical values for generated HSYNC signals
Table 18. Typical values for generated VSYNC signals
HGENR (hex value)
H Period
HFREQ
Pulse Width
Duty Cycle
13
5 s
200 kHz
2 s
40%
1F
8 s
125 kHz
2 s
25%
3F
16 s
62.5 kHz
2 s
12.5%
7F
32 s
31.25 kHz
2 s
6.2%
FF
64 s
15.6 kHz
2 s
3.1%
HGENR
(hex value)
H Period
H Freq
V11bits
(hex value)
V Period
V Freq
Pulse width
13
5 s
200 kHz
7FF (2047)
10.2 ms
97.7 Hz
20 s
13
5 s
200 kHz
400 (1024)
5.1 ms
195 Hz
20 s
1F
8 s
125 kHz
7FF (2047)
16.3 ms
61 Hz
32 s
1F
8 s
125 kHz
400 (1024)
8.2 ms
122 Hz
32 s
3F
16 s
62.5 kHz
7FF (2047)
32.6 ms
30.6 Hz
64 s
3F
16 s
62.5 kHz
400 (1024)
16.4 ms
60.9 Hz
64 s
7F
32 s
31.25 kHz
7FF (2047)
65.5 ms
15 Hz
128 s
7F
32 s
31.25 kHz
400 (1024)
32.8 ms
30 Hz
128 s
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