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參數(shù)資料
| 型號(hào)： | HD66787 |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | 528-channel, One-chip Driver with 262,144-color Display RAM and Power Supply Circuit for Low-temperature Poli-Si TFT (LTPS-TFT) Panels with Incorporat |
| 中文描述： | 528與262,144色顯示RAM和低電源電路通道，單芯片驅(qū)動(dòng)器的溫度和旋鈴聲非晶硅TFT（薄膜晶體管）與Incorporat小組 |
| 文件頁(yè)數(shù)： | 106/159頁(yè) |
| 文件大?。?/td> | 1607K |
| 代理商： | HD66787 |
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HD66787
Preliminary
Rev.0.22, May.23.2003, page 106 of 159
High-Speed Burst RAM Write Function
The HD66787 incorporates high-speed burst RAM-write function, which writes data to RAM in one-fourth
the access time required for a standard RAM-write operation. This function is especially useful for
applications which require the high-speed rewrite of the display data such as display of colored moving
picture and so on.
In the high-speed RAM write mode (HWM), data to write to RAM is temporarily stored to the internal
register of HD66787. The data storage in the register is executed by word. When the data storage
operation is executed 4 times, all data stored in the register are written to RAM at once. While the data is
being written from the register to RAM, another set of data is being written to the register. This function
enables high-speed and consecutive RAM write, which are required in displaying moving pictures and so
on.
Microcomputer
GRAM
Address
counter
(AC)
18
72
16
“0000H”
“0001H”
“0002H”
“0003H”
Register 1
Register 2
Register 3
Register 4
Operational flow of High-Speed Burst RAM Write
1
2
3
4
1
2
3
4
1
2
3
4
(R22)
RAM
data
1
(R22)
execution time
execution time
execution time
RAM data 1 to 4
RAM data 5 to 8
RAM data 9 to 12
“0000”H
“0004”H
“0008”H
“000A”H
RAM address
(AC15 to 0)
RAM write data
(72 bits)
(input)
E
(input)
(input/output)
Index
1
RAM
data
2
RAM
data
3
RAM
data
4
RAM
data
5
RAM
data
6
RAM
data
7
RAM
data
8
RAM
data
9
RAM
data
10
RAM
data
11
RAM
data
12
Index
RAM write
RAM write
RAM write
The lower two bits of the address must be set as follows in the high-speed write mode.
When ID0 = 0, set the lower two bits of the address to 11.
When ID1 = 1, set the lower two bits of the address to 00.
Note : When terminating the high-speed RAM write, wait for the time required for the RAM write execution
(bus cycle line (tCYC) in the normal write mode) before executing the next instruction.
CS*
DB15-0
High-Speed Consecutive Write to RAM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66840 | Peripheral IC |
| HD66840F25 | LCD Controller |
| HD66840F30 | LCD Controller |
| HD66841FP | LCD Controller |
| HD66841FS | LCD Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66789 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:528-channel, One-chip Driver for Amorphous TFT Panels with 262,144-color display RAM, Power Supply Circuit, and Gate Circuit |
| HD667A66R | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:132 x 176-dot Graphics LCD Controller/Driver for 65K Colors |
| HD667B66R | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:132 x 176-dot Graphics LCD Controller/Driver for 65K Colors |
| 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 |
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