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參數(shù)資料
| 型號： | 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： | （內存提供160通道4級灰度的點陣圖形液晶顯示驅動程序） |
| 文件頁數(shù)： | 16/46頁 |
| 文件大小： | 201K |
| 代理商： | HD66421 |
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Preliminary
Rev. 1.1E '99.02.10
HD66421
Display RAM Configuration and Display
The HD66421 incorporates a bit-mapped display
RAM. It has 320 bits in the X direction and 100
bits in the Y direction. The 320 bits are divided
into forty 8-bit groups. As shown in figure 7, data
written by the MPU is stored horizontally with the
MSB at the far left and the LSB at the far right.
The consecutive two bits control one pixel of LCD
in 4-level gray scale mode, this means that one
8-bits data contains data which controls four
pixels. One bit of memory designates one dot of
display in the monochrome display mode.
The ADC bit of control register 1 can control the
positional relationship between X addresses of the
RAM and LCD driver output (figure 8).
Specifically. the data in address H'0 is output
from SEG1 when the ADC bit in control register
1 is 0, and from SEG160 otherwise. Here. data in
each 8-bit group is also inverted. Because of this
function, the data in X address H'0 can be always
displayed on the top left of an LCD panel with the
MSB at the far left regardless of the LSI is
positioned with respect to the panel. In this case,
DB7, DB5, DB3 and DB1 are more significant bit
in consecutive two bits.
H'00
H'01
Y
H'0
H'1
H'27
X addresses
SEG1
SEG160
LCD drive signal output
(a) MON = 0, ADC = 0, WLS= 0
(b) MON = 0, ADC = 1, WLS= 0
Figure 7 Display RAM Data and Display in Gray Scale Mode
Figure 8 Display RAM Configuration in Gray Scale Mode
H'62
H'63
H'00
H'01
Y
H'0
H'26
H'27
SEG1
SEG160
H'62
H'63
MSB
MSB
LCD drive signal output
X addresses
SEG1
SEG2
SEG3
SEG4
1 1 1 0 0 1 0 0
0 0 0 1 1 0 1 1
D
B
7
6
5
4
Y0
Y1
D
B
1
LCD panel
Display RAM
SEG157
SEG158
DEG159
SEG160
1 1 1 0 0 1 0 0
0 0 0 1 1 0 1 1
D
B
0
2
3
1
Y0
Y1
D
B
7
LCD panel
Display RAM
D
B
6
D
B
4
D
B
5
D
B
D
B
D
B
D
B
D
B
D
B
D
B
3
D
B
2
D
B
0
(a) MON = 0, ADC = 0, WLS= 0
(b) MON = 0, ADC = 1 , WLS= 0
SEG160
SEG1
16
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| HD66421TB0 | (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD) |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| HD66421TB0 | 制造商:Renesas Electronics Corporation 功能描述: |
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| 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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