參數(shù)資料
型號: W78CE354P
廠商: WINBOND ELECTRONICS CORP
英文描述: MONITOR MICROCONTROLLER
中文描述: 顯示器單片機
文件頁數(shù): 36/44頁
文件大小: 426K
代理商: W78CE354P
W78C354
- 36 -
If the bit VDISHC of SFR CONTREG2 is set high, the H-clamp pulse output will be disabled in the V
sync pulse period.
VDISHC
V
H
H-clamp
IN
IN
Figure 16. Disable H-clamp output
M-6. Safe Operation Area (SOA) Output
The purpose of the SOA output is to protect the HOT (horizontal oscillating transistor) and other
critical circuitry by responding quickly if the Hsync frequency suddenly drops below a preset boundary
frequency. When the Hsync frequency is lower than the preset boundary frequency for three
consecutive cycles or stops for a certain period, the SOA pin (P1.5) will change to a "high" state to
activate an external circuit to protect the monitor. If the bit P15SF is set in SFR CONTREG4, the pin
P1.5 can be used as the SOA output (refer to Figure 17). The SOA pin can be released by writing any
value to SFR SOACLR.
CONDITION Of P15SF
PORT 1.5 I/O PIN FUNCTION
P15SF = 0
General I/O pin
P15SF = 1 & P1.5 = 0
SOA output
0
1
P15SF
P1.5/SOA
P1.5 output latch
SOA output
Figure 17. Alternate function of P1.5
Boundary frequency H
BOUN
D
= 2 MHz
÷
(Value of SOAREG)
Example: If 50 KHz is considered the boundary frequency, then value of SOAREG = 2M
ò
50K =
40.
No Hsync response time = 2048
×
(1/F
CLOCK
).
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