參數(shù)資料
型號(hào)： BT457KPJ80
英文描述： Video DAC with Color Palette (RAMDAC)
中文描述： 視頻DAC的調(diào)色板（的RAMDAC）
文件頁(yè)數(shù)： 42/60頁(yè)
文件大?。?/td> 647K
代理商： BT457KPJ80
4.0 Application Information
Bt457/Bt458
4.7 Initializing the Bt457 (Color) 8-bit MPU Data Bus
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette
4-10
Conexant
L45801 Rev. N
Green Bt457
Write $04 to address register
Write $FF to read mask register
Write $05 to address register
Write $00 to blink mask register
Write $06 to address register
Write $40 to command register
Write $07 to address register
Write $02 to test register
Blue Bt457
Write $04 to address register
Write $FF to read mask register
Write $05 to address register
Write $00 to blink mask register
Write $06 to address register
Write $40 to command register
Write $07 to address register
Write $04 to test register
Color Palette RAM Initialization
Write $00 to all three address registers
Write red data to RAM (location $00)
Write green data to RAM (location $00)
Write blue data to RAM (location $00)
Write red data to RAM (location $01)
Write green data to RAM (location $01)
Write blue data to RAM (location $01)
:
Write red data to RAM (location $FF)
Write green data to RAM (location $FF)
Write blue data to RAM (location $FF)
Overlay Color Palette Initialization
Write $00 to all three address registers
Write red data to overlay (location $00)
Write green data to overlay (location $00)
Write blue data to overlay (location $00)
Write red data to overlay (location $01)
Write green data to overlay (location $01)
Write blue data to overlay (location $01)
:
Write red data to overlay (location $03)
Write green data to overlay (location $03)
Write blue data to overlay (location $03)
00
10
00
10
00
10
00
10
00
10
00
10
00
10
00
10
00
01
01
01
01
01
01
:
01
01
01
00
11
11
11
11
11
11
:
11
11
11
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