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參數資料
| 型號： | HD66421TB0 |
| 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： | 14/46頁 |
| 文件大?。?/td> | 201K |
| 代理商： | HD66421TB0 |
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Preliminary
Rev. 1.1E '99.02.10
HD66421
Column Address Inversion According to LCD
Driver Layout:
The HD66421 can always
display data in address H'0 on the top left of an
LCD panel regardless of where it is positioned
with respect to the panel. This is because the
HD66421 can invert the positional relationship
between display RAM addresses and LCD driver
output pins by inverting RAM addresses.
Specifically, the HD66421 outputs data in
address H'0 from SEG1 when the ADC bit in
control register 1 is 0, and from SEG160
otherwise. Here. the scan direction of row output
is also inverted according to the situation. as
shown in figure 6. Note that addresses and scan
direction are inverted when data is written to the
display RAM, and thus changing the ADC bit
after data has been written has no effect.
Therefore. hardware control bits such as ADC
must be set immediately after reset is canceled,
and must not be set while data is being displayed.
Figure 5 LCD Driver Layout and RAM addresses : 1/100 Duty cycle
COM1
COM50
LCD panel
COM100
COM51
b) ADC = 1
S
S
S
S
S
S
S
S
S
S
S
COM100
COM51
COM1
COM50
a) ADC = 0
H'0
S
S
S
S
S
S
S
S
S
S
S
LCD panel
DTY1
COMMON
SEGMENT
DTY0
ADC
0
1
COM1 –> COM50, COM100 –> COM51
COM51 –> COM100, COM50 –> COM1
H'00 –> SEG1
H'00 –> SEG160
0
1
COM1 –> COM40, COM100 –> COM61
COM61 –> COM100, COM40 –> COM1
H'00 –> SEG1
H'00 –> SEG160
0
1
H'00 –> SEG1
H'00 –> SEG160
0
1
8 COM depend on R11
8 COM depend on R11
H'00 –> SEG1
H'00 –> SEG160
0
0
0
1
1
0
1
1
Table 1 Scanning Direction and RAM Address
H'1
H'0
H'1
HD66421
HD66421
COM1 –> COM32, COM100 –> COM69
COM69–> COM100, COM32 –> COM1
14
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相關代理商/技術參數 |
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|---|---|
| HD66503 | 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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| HD66520TB0 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:160-Channel 4-Level Grayscale Display Column Driver with Internal Bit-Map RAM |
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