參數(shù)資料
型號(hào)： HD44780
廠商： Hitachi,Ltd.
英文描述： Dot Matrix Liquid Crystal Display Controller/Driver
中文描述： 點(diǎn)陣式液晶顯示控制器/驅(qū)動(dòng)器
文件頁(yè)數(shù)： 16/59頁(yè)
文件大?。?/td> 316K
代理商： HD44780
HD44780U
16
Handling unused character patterns
1. EPROM data outside the character pattern area: Always input 0s.
2. EPROM data in CGRAM area: Always input 0s. (Input 0s to EPROM addresses 00H to FFH.)
3. EPROM data used when the user does not use any HD44780U character pattern: According to the user
application, handled in one of the two ways listed as follows.
a. When unused character patterns are not programmed: If an unused character code is written into
DDRAM, all its dots are lit. By not programing a character pattern, all of its bits become lit. (This is
due to the EPROM being filled with 1s after it is erased.)
b. When unused character patterns are programmed as 0s: Nothing is displayed even if unused
character codes are written into DDRAM. (This is equivalent to a space.)
Table 3
Example of Correspondence between EPROM Address Data and Character Pattern
(5
×
10 Dots)
A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
A11
Data
O4 O3 O2 O1 O0
0 0 0 1
0 0 1 0
0 0 1 1
0 1 0 0
0 1 0 1 0 0 1 0
EPROM Address
Character code
Line
position
LSB
0 1 0 1
0 1 1 0
0 1 1 1
1 0 0 0
0 0 0 0 0
0 0 0 0 0
0 1 1 0 1
1 0 0 1 1
1 0 0 0 1
1 0 0 0 1
0 1 1 1 1
0 0 0 0
1 0 0 1
1 0 1 0
1 0 1 1
1 1 0 0
1 1 0 1
1 1 1 0
1 1 1 1
Cursor position
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 1
0 0 0 0 1
0 0 0 0 1
Notes: 1. EPROM addresses A11 to A3 correspond to a character code.
2. EPROM addresses A3 to A0 specify a line position of the character pattern.
3. EPROM data O4 to O0 correspond to character pattern data.
4. EPROM data O5 to O7 must be specified as 0.
5. A lit display position (black) corresponds to a 1.
6. Line 11 and the following lines must be blanked with 0s for a 5
×
10 dot character fonts.
相關(guān)PDF資料
PDF描述
HD44780U Dot Matrix Liquid Crystal Display Controller/Driver
HD44780UA00FS 320 x 240 pixel format, CFL backlight available with power harness
HD44780UA00TF 320 x 240 pixel format, CFL backlight available with power harness
HD44780UA02FS 320 x 240 pixel format, CFL backlight available with power harness
HD44780UA02TF 320 x 240 pixel format, CFL backlight available with power harness
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