參數(shù)資料
型號(hào)： HD66728
廠商： Hitachi,Ltd.
英文描述： 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器)
中文描述： 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動(dòng)器（112 × 80點(diǎn)圖形液晶顯示控制器）
文件頁數(shù)： 19/138頁
文件大?。?/td> 2158K
代理商： HD66728
HD66728
19
Timing Generator
The timing generator generates timing signals for the operation of internal circuits such as the DDRAM,
CGROM, and CGRAM. The RAM read timing for display and internal operation timing by MPU access
are generated separately to avoid interference with one another. This prevents flickering in areas other than
the display area when writing data to the DDRAM, for example.
Cursor/Blink Controller
The cursor/blink (or black-and-white reversed) control is used to create a cursor or a flashing area on the
display in a position corresponding to the location stored in the address counter (AC).
00 01 02 03 04 05 06 07 08 09 0A
1
2
3
4
5
6
7
8
9 10 11
Cursor position
Display position
DDRAM address
0B
12
Note: The cursor/blink or black-and-white reversed control is also
active when the address counter indicates the CGRAM.
However, it has no effect on the display.
Figure 3 Cursor Position and DDRAM Address (AC = 08H)
Oscillation Circuit (OSC)
The HD66728 can provide R-C oscillation simply through the addition of an external oscillation-resistor
between the OSC1 and OSC2 pins. The appropriate oscillation frequency for operating voltage, display
size, and frame frequency can be obtained by adjusting the external-resistor value. Clock pulses can also be
supplied externally. Since R-C oscillation stops during the standby mode, current consumption can be
reduced. For details, see the Oscillation circuit section.
Liquid Crystal Display Driver Circuit
The liquid crystal display driver circuit consists of 80 common signal drivers (COM1 to COM80) and 112
segment signal drivers (SEG1 to SEG112). When the number of lines are selected by a program, the
required common signal drivers automatically output drive waveforms, while the other common signal
drivers continue to output unselected waveforms.
Character pattern data is sent serially through a 112-bit shift register and latched when all needed data has
arrived. The latched data then enables the segment signal drivers to generate drive waveform outputs.
The shift direction of 112-bit data can be changed by the SGS bit. The shift direction for the common
driver can also be changed by the CMS bit by selecting an appropriate direction for the device mounting
configuration.
相關(guān)PDF資料
PDF描述
HD66730 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
HD66731 Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動(dòng)器)
HD66731A00TB0L 122 x 32 pixel format, Compact LCD size
HD66731A00TA0L Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HD66731A01TA0L Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD66729 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions
HD66730 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HD66730A00FS 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HD66730A01FS 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
HD66731 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
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