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STV9936S bảng dữ liệu(PDF) 30 Page - STMicroelectronics

tên linh kiện STV9936S
Giải thích chi tiết về linh kiện  120-MHz On-Screen Display for Monitors with 4 True Independent Window Displays
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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RAM Specification
STV9936P/S
30/48
The default window RAM allocations are listed in Table 32.
Window 1: 10 blocks of 32 words = 320 characters (ALW1 = 9).
Window 2: 4 blocks of 32 words = 128 characters (ALW2 = 3).
Window 3: 4 blocks of 32 words = 128 characters (ALW3 = 3).
Window 4: the remaining RAM (4 blocks = 128 characters).
5.4
Window Reset
All the RAM data from one of the four OSD windows can be reset by writing to bits RESETW[3:0].
When the RESETW bit is set to 1,all the RAM data in the allocation memory space of the
corresponding OSD window is reset. These bits are automatically cleared when the RAM allocation
reset is finished.
All programmable registers are in Row 0 (Column i, Row 0).
Table 32: Window RAM Default Values
ALWi
Default
Description
ALW1
9h
320 Characters (10 blocks)
ALW2
3h
128 Characters (4 blocks)
ALW3
3h
128 Characters (4 blocks)
Table 33: RAM Allocation Enable and Reset
FWR
FAC
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
80h
0Bh
0h
RESETW[3:0]



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