參數(shù)資料
型號(hào): SSD1905QT2
廠商: Electronic Theatre Controls, Inc.
英文描述: LCD Graphics Controller CMOS
中文描述: LCD圖形控制器的CMOS
文件頁(yè)數(shù): 117/153頁(yè)
文件大?。?/td> 863K
代理商: SSD1905QT2
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SOLOMON
Rev 1.3
10/2002
SSD1905
108
Note
For synchronous bus interfaces, it is recommended that BCLK be set the same as the CPU bus clock (not a
divided version of CLKI) e.g. SH-3, SH-4.
11.1.2 MCLK
MCLK provides the internal clock required to access the embedded SRAM. The SSD1905 is designed with
efficient power saving control for clocks (clocks are turned off when not used).
Furthermore, reducing the MCLK frequency relative to the BCLK frequency increases the CPU cycle latency and
so reduces screen update performance. For a balance of power saving and performance, the MCLK should be
configured to have a high enough frequency setting to provide sufficient screen refresh as well as acceptable CPU
cycle latency.
The source clock options for MCLK may be selected as in the following table.
Table 11-2 : MCLK Clock Selection
Source Clock Options
BCLK
BCLK
÷
2
BCLK
÷
3
BCLK
÷
4
MCLK Selection (REG[04h] bits 5:4)
00
01
10
11
11.1.3 PCLK
PCLK is the internal clock used to control the LCD panel. PCLK should be chosen to match the optimum frame
rate of the LCD panel. See Section 13 ”Frame Rate Calculation” for details on the relationship between PCLK and
frame rate.
Some flexibility is possible in the selection of PCLK. Firstly, LCD panels typically have a range of permissible frame
rates. Secondly, it may be possible to choose a higher PCLK frequency and tailor the horizontal and vertical non-
display periods to lower the frame-rate to its optimal value.
The source clock options for PCLK may be selected as in the following table.
Table 11-3 : PCLK Clock Selection
Source Clock Options
MCLK
MCLK
÷
2
MCLK
÷
3
MCLK
÷
4
MCLK
÷
8
BCLK
BCLK
÷
2
BCLK
÷
3
BCLK
÷
4
BCLK
÷
8
CLKI
CLKI
÷
2
CLKI
÷
3
CLKI
÷
4
CLKI
÷
8
AUXCLK
AUXCLK
÷
2
AUXCLK
÷
3
AUXCLK
÷
4
PCLK Selection
(
REG[05h] bits 6:4)
00h
10h
20h
30h
40h
01h
11h
21h
31h
41h
02h
12h
22h
32h
42h
03h
13h
23h
33h
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