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參數(shù)資料
| 型號： | HCD66717A03 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 晶體 |
| 英文描述： | (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver) |
| 中文描述： | （低功耗點陣液晶顯示控制器/驅(qū)動器） |
| 文件頁數(shù)： | 21/90頁 |
| 文件大小： | 716K |
| 代理商： | HCD66717A03 |
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HD66717
473
Programming Character Patterns
This section explains the correspondence between addresses and data used to program character patterns
in EPROM.
Programming to EPROM
The HD66717 character generator ROM can generate 240 5
×
8-dot character patterns. Table 7 shows
correspondence between the EPROM address data and the character pattern.
Handling Unused Character Patterns
1. EPROM data outside the character pattern area: This is ignored by the character generator ROM for
display operation so any data is acceptable.
2. EPROM data in CGRAM area: Always fill with zeros.
3. Treatment of unused user patterns in the HD66717 EPROM: According to the user application, these
are handled in either of two ways:
a. When unused character patterns are not programmed: If an unused character code is written into
DDRAM, all its dots are lit, because the EPROM is 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 7
Example of Correspondence between EPROM Address Data and Character Pattern
(5
×
8 Dots)
A10A9 A8 A7 A6 A5 A4 A3
A2 A1 A0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
1
1
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
0
0
0
0
1
1
1
0
0
0
0
0
O4 O3 O2 O1 O0
Character code
Line position
EPROM Address
Data
LSB
MSB
0
0
0
0
0
0
0
0
“0”
A11
0
1
0
1
1
0
0
1
Notes: 1. EPROM addresses A11 to A4 correspond to a character code.
2. EPROM addresses A2 to A0 specify the line position of the character pattern. EPROM address
A3 should be set to 0.
3. EPROM data O4 to O0 correspond to character pattern data.
4. Areas which are lit (indicated by shading) are stored as 1, and unlit areas as 0.
5. The eighth raster-row is also stored in the CGROM, and should also be programmed. If the
eighth raster-row is used for a cursor, this data should all be set to zero.
6. EPROM data bits O7 to O5 are invalid. 0 should be written in all bits.
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