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參數(shù)資料
| 型號： | HD64646 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | LCTC (LCD Timing Controller) |
| 中文描述： | LCTC（LCD定時控制器） |
| 文件頁數(shù)： | 21/50頁 |
| 文件大?。?/td> | 156K |
| 代理商： | HD64646 |
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HD64645/64646
21
Character Mode and Graphic Mode
The LCTC supports two types of display modes; character mode and graphic mode. Graphic mode 2 is
provided to utilize software for a system using the CRTC (HD6845).
The display mode is controlled by an OR between the mode select pins (D/
S
, G/
C
, LS, WIDE, AT) and
mode register (R22).
Character Mode:
character mode displays characters by using CG-ROM. The display data supplied from
memory is accessed in 8-bit units. A variety of character attribute functions are provided, such as reverse
video, blinking, nondisplay (white or black), by storing the attribute data in attribute RAM (A-RAM).
Figure 10 illustrates the relation between character display screen and memory contents.
Graphic Mode 1:
Graphic mode 1 directly displays data stored in a graphic memory buffer. The display
data supplied from memory is accessed in 16-bit units. Character attribute functions or wide mode are not
provided. Figure 11 illustrates the relation between graphic display screen and memory contents.
Graphic Mode 2:
Graphic mode 2 utilizes software for a system using the CRTC (HD6845). The display
data supplied from memory is accessed in 16-bit units. Character attribute functions or wide mode are not
provided. The same memory addresses are output repeatedly the number of times specified by maximum
raster register (R9). The raster address is output in the same way as in character mode.
Reverse
video
Blinking
1st
row
2nd
row
VRAM
(char.
code)
8-bit
41
42
43
ARAM
(Attr.
code)
8-bit
08
20
00
44
45
46
00
00
00
Reverse video
Blinking
Start
address
1st
row
2nd
row
Figure 10 Relation between Character Screen and Memory Contents
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