參數(shù)資料
型號： HD66731A01TA0L
廠商： Hitachi,Ltd.
英文描述： Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display
中文描述： 點陣液晶顯示控制器/驅動器支持日語漢字，韓文字體顯示
文件頁數(shù)： 88/131頁
文件大?。?/td> 5332K
代理商： HD66731A01TA0L
HD66730/HD66731
87
Combined Display of Full-Size and Half-Size Characters
The HD66730/1 performs display from the left edge of the display combining 12-dot full-size (character
size: 11
×
12 dots) and 6-dot half-size characters (character size: 6
×
12 dots). There will be a one-dot space
between these fonts.
The most significant bit in the data (8 bits) in DDRAM is allocated to the designation bit indicating a full-
size or half-size character. When this MSB is 0, the full-size character is selected, and when 1, the half-size
character is selected.
When the full-size character is selected, 2 bytes of DDRAM are linked and used as a 16-bit code (Figure
22). In this case, the lower byte is written into the smaller DDRAM address. 12 bits of this 16-bit code are
used as character codes. Up to 4096 character codes can be specified. In addition, two of the remaining four
bits can be allocated to a display-attribute code and can designate white/black inverted display for
individual characters (refer to Display Attribute Designation). Table 18 shows the relationship between the
16-bit designated JIS code and the HD66730/1 12-bit character code. 8-bit data designating half-size
characters are used as an 8-bit code (Figure 23). Specifically, 7 bits of the 8-bit half-size characters become
the character codes, so that a total of 128 characters can be displayed (alphanumeric characters and symbols
can be displayed as half-size characters).
User fonts can be displayed using the CGRAM. Special symbols not included in the internal CGROM or
the JIS Level-2 Kanji Set can be displayed as needed. Since the display font size of the CGRAM is 12
×
13
dots, CGRAM fonts can be displayed to the right, left, top or bottom, in order to be used to display double-
size characters or graphics. Note that the display-attribute code (A1/A0) designation that is to be written
into the DDRAM is ignored when the CGRAM is used. In this case, bits 6 and 7 in the CGRAM are used
for display-attribute-code designation. Refer to CGRAM for details.
Table 19
Relationship between JIS Codes and HD66730 Character Codes
JIS first byte code: b1 to b7 (7 bits)
JIS second byte code: a1 to a7 (7 bits)
CGRAM address for user fonts: u0 to u2 (3 bits)
Character Code Arrangement of HD66730
JIS
b7
b6
b5
C11 C10 C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
Non-kanji
0
1
0
a7
a6
b3
b2
b1
0
0
a5
a4
a3
a2
a1
Level 1 kanji
0
1
1
b7
b4
b3
b2
b1
a7
a6
a5
a4
a3
a2
a1
Level 1 kanji
1
0
0
b7
b4
b3
b2
b1
a7
a6
a5
a4
a3
a2
a1
User font
—
—
—
0
0
0
0
0
0
0
0
0
u2
u1
u0
Upper byte
Lower byte
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