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參數(shù)資料
| 型號： | HD667B66R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors |
| 中文描述： | 132 × 176點圖形LCD控制器/驅動器的65K色 |
| 文件頁數(shù)： | 46/97頁 |
| 文件大?。?/td> | 681K |
| 代理商： | HD667B66R |
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HD66766R Rev. 1.0-1 / September 2002
46
High-Speed Burst RAM Write Function
The HD66766R has a high-speed burst RAM-write function that can be used to write data to RAM in
one-fourth the access time required for an equivalent standard RAM-write operation. This function is
especially suitable for applications that require the high-speed rewriting of the display data, for example,
display of color animations, etc.
When the high-speed RAM-write mode (HWM) is selected, data for writing to RAM is once stored to the
HD66766R internal register. When data is selected four times per word, all data is written to the on-chip
RAM. While this is taking place, the next data can be written to an internal register so that high-speed
and consecutive RAM writing can be executed for animated displays, etc.
Figure 33 Flow of Operation in High-Speed Consecutive Writing to RAM
Figure 34 Example of the Operation of High-Speed Consecutive Writing to RAM
48
Address
counter
(AC)
16
Microcomputer
16
GRAM
"0000"H
"0002"H
"0003"H
"0001"H
Resistor 1
Resistor 2
Resistor 3
Resistor 4
CS*
(input)
DB15-0
(input / output)
RAM write data
(48 bit)
RAM address
(AC15 to 0)
“0000”H
“0004”H
“0008”H
“000A”H
RAM data 1 to 4
RAM data 5 to 8
RAM data 9 to 12
Index
(R22)
RAM
data
(1)
RAM
data
(2)
R4M
data
(3)
RAM
data
(4)
RAM
data
(5)
RAM
data
(6)
RAM
data
(7)
RAM
data
(9)
RAM
data
(8)
RAM
data
(11)
RAM
data
(10)
RAM
data
(12)
RAM write
execution time
RAM write
execution time
RAM write
execution time *
Index
(R22)
1
2
3
4
1
2
3
4
1
2
3
4
* The lower two bits of the address must be set in the following way in high-speed write mode.
When D0 becomes 0, the lower two bits of the address must be set to “11”.
Wen D1 becomes 1, the lower two bits of the address must be set to “00”.
Note: When a high-speed RAM write is canceled, the next instruction must only be
executed after the RAM write execution time has elapsed.
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PDF描述 |
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| HD66841 | LVIC-II (LCD Video Interface Controller)(LCD視頻控制器) |
| HD68000Y-10 | MPU(MICRO PROCESSING UNIT) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HD66840 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Peripheral IC |
| HD66840F25 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Controller |
| HD66840F30 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Controller |
| HD66841FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Controller |
| HD66841FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Controller |
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