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ML9040A 参数 Datasheet PDF下载

ML9040A图片预览
型号: ML9040A
PDF下载: 下载PDF文件 查看货源
内容描述: 具有16点共同驱动器和40点段驱动点阵LCD控制器 [DOT MATRIX LCD CONTROLLER WITH 16-DOT COMMON DRIVER AND 40-DOT SEGMENT DRIVER]
分类和应用: 驱动器控制器
文件页数/大小: 49 页 / 432 K
品牌: OKI [ OKI ELECTRONIC COMPONETS ]
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PEDL9040A-03  
¡ Semiconductor  
ML9040A-Axx/-Bxx  
Character Generator RAM (CG RAM)  
The CG RAM is used to display user's original character patterns other than character  
patterns in the CG ROM.  
The CG RAM has a capacity (64 bytes = 512 bits) of writing 8 kinds of characters for 5 x 7  
dots and 4 kinds of characters for 5 x 10 dots.  
When displaying character patterns stored in the CG RAM, write 8-bit character codes (00  
to 07 or 08 to 0F; hex.) on the left side as shown in Table 2. Then it is possible to output the  
character pattern to the LCD display position corresponding to the DD RAM address.  
The following explains how to write and read character patterns to and from the CG RAM.  
(1)When the character pattern is 5 x 7 dots (see Table 3-1).  
• A method of writing character pattern to the CG RAM by CPU:  
Three bits of CG RAM addresses 0-2 correspond to the line position of the character  
pattern.  
First, set increment or decrement by the CPU, and then input the CG RAM address.  
After this, write character patterns to the CG RAM through DB - DB line by line.  
0
7
DB to DB correspond to CG RAM data 0-7 in Table 3-1.  
0
7
It is displayed when "H" is set as input data and is not displayed when "L" is set as  
input data.  
Since the ADC is automatically incremented or decremented by 1 after the writing of  
data to the CG RAM, it is not necessary to set the CG RAM address again.  
The line, in which the CG RAM addresses 0-2 are all "H" ("7" in hexadecimal  
notation), is the cursor position. It is ORed with the cursor at the cursor position and  
displayed to LCD.  
For this reason, it is necessary to set all input data that become cursor positions to "L".  
Although CG RAM data 0-4 bits are output to the LCD as display data, CG RAM data  
bits 5-7 are not output. The latter can be written and read to and from the RAM, it  
is therefore allowed to be used as data RAM.  
• A method of displaying the CG RAM character pattern to the LCD:  
The CG RAM is selected when upper 4 bits of the character codes are all "L".  
As character code bit 3 is invalid, the display of "0" in Table 3-1, is selected by  
character code "00" (hex.) or "08" (hex.).  
Whenthe8-bitcharactercodeoftheCGRAMiswrittentotheDDRAM, thecharacter  
pattern of the CG RAM is displayed on the LCD display position corresponding to  
the DD RAM address. (DD RAM data, bits 0-2 correspond to CG RAM address, bits  
3-5.)  
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