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參數(shù)資料
| 型號(hào)： | HD66421 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| 中文描述： | （內(nèi)存提供160通道4級(jí)灰度的點(diǎn)陣圖形液晶顯示驅(qū)動(dòng)程序） |
| 文件頁數(shù)： | 25/46頁 |
| 文件大?。?/td> | 201K |
| 代理商： | HD66421 |
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Preliminary
Rev. 1.1E '99.02.10
HD66421
Arbitration Control
The HD66421 controls the arbitration between
draw access and display access. The draw access
read and write display data of display
memory incorporated in the HD66421. The
display access outputs display data to the liquid
crystal panel. The draw access has the priority
over display access, so continuous access is
enabled without having the system to wait. For
arbitration control, draw access is recognized as
valid when CS and WR/RD are low.
When draw and display access occur at the same
time, draw access is executed prior to display
access. Display access is executed between two
draw access during display access period. If a
period of one draw access is longer than that of
display access, display access will not be
executed properly. If this condition happens
frequently, flicker will be seen on the display.
The low level width of WR and RD must be less
than the period of display access - 450ns.
25
Draw access
Draw access
Display access
period
CS
WR
RD
Figure 19 Definition of Draw Access
Display Access Period
CS
WR
Display Access
(min. 450ns)
Figure 21 WR Low Level Width
Draw Access
period of 4 clocks (22us approx. ) *
Memory Access
period of 4 clocks (22
μ
s approx ) *
Display Access Period
CS
WR
Memory Access
Display Access
Draw Access
Figure 20 Memory Access when Display and Draw Access Occur at The Same Time
* In the case of fOSC = 180kHz
* In the case of fOSC = 180kHz
period of 4 clocks - 450ns
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66421TB0 | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
| HD66503 | 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時(shí)電路的240通道驅(qū)動(dòng)器) |
| HD66520T | 160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM(點(diǎn)陣圖形LCD160通道驅(qū)動(dòng)器) |
| HD66522 | 160-Channel Column Driver with Internal Bit-Map RAM for Reflective Color Display and Grayscale Display(點(diǎn)陣圖形LCD160通道驅(qū)動(dòng)器) |
| HD66523R | 240-Channel Common Driver with Internal LCD Timing Circuit(帶內(nèi)部LCD定時(shí)電路的240通道驅(qū)動(dòng)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66421TB0 | 制造商:Renesas Electronics Corporation 功能描述: |
| HD66503 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520T | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| HD66520TA0 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
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