參數(shù)資料
型號(hào)： W78CE354
廠商： WINBOND ELECTRONICS CORP
英文描述： MONITOR MICROCONTROLLER
中文描述： 顯示器單片機(jī)
文件頁(yè)數(shù)： 33/44頁(yè)
文件大?。?/td> 426K
代理商： W78CE354
W78C354
Publication Release Date: October 1996
- 33 -
Revision A1
V frequency:
Resolution of V frequency counter: V
RESOL
= (1/F
CLOCK
)
×
16
V-frequency: V
FREQ
= 1/(V
COUNT
×
V
RESOL
)
Lowest V frequency can be detected: F
CLOCK
ò
1048576
H frequency:
Resolution of H frequency counter: H
RESOL
= (1/F
CLOCK
)
ò
8
H-frequency: H
FREQ
= 1/(H
COUNT
×
H
RESOL
)
Lowest H frequency can be detected: F
CLOCK
ò
8192
16 MHz
18.432 MHz
20 MHz
Vresol
1
μ
S
15 Hz
868 nS
800 nS
Lowest V
FREQ
17.6 Hz
19 Hz
Hresol
7.8 nS
6.8 nS
6.3 nS
Lowest H
FREQ
1.9 KHz
2.3 KHz
2.4 KHz
M-4. Dummy Frequency Generator
The dummy H and V frequencies are generated for factory burn-in measurement and for displaying a
warning message when there is no input H/V frequency. The dummy sync generator includes two
newly added SFRs, DHREG and DVREG. DHREG is a 4-bit register used to determine the dummy
Hsync output frequency. DVREG is an 8-bit register that can be used to preset a constant into
DVREG to determine the dummy Vsync output frequency by the formulas listed below.
Dummy Hsync frequency F
dH
= F
CLOCK
ò
32
ò
(DHREG+1)
Dummy Vsync frequency F
dV
= F
dH
ò
8
ò
(DVREG+1)
Example: Assume system clock = 16 Mhz
DHREG
F
DH
DVREG
F
DV
15
31.25K
48
79.7 Hz
12
38.5K
59
80.2 Hz
10
45.5K
70
80.1 Hz
9
50K
77
80.1 Hz
7
62.5K
96
80.5 Hz
5
82K
127
80.1 Hz
4
100K
155
80.1 Hz
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