參數(shù)資料
型號(hào)： HD64646
廠商： Hitachi,Ltd.
英文描述： LCTC (LCD Timing Controller)
中文描述： LCTC（LCD定時(shí)控制器）
文件頁(yè)數(shù)： 28/50頁(yè)
文件大小： 156K
代理商： HD64646
HD64645/64646
28
Easy Mode
This mode utilizes software for systems using the CRTC (HD6845). By setting MODE pin to high, the
display mode and screen format are fixed as shown in Table 8. With this mode, software for a CRT screen
can be utilized in a system using the LCTC, without changing the BIOS.
Automatic Correction of Down Panel Raster Address
When the LCTC mode is set for character display and dual screen, memory addresses (MA) and raster
addresses (RA) are output in such a way as to keep continuity of a display spread over the two panels.
Therefore users can use the LCTC without considering the multiplexing duty ratio (the number of vertical
dots of a screen) or the character font. (See Figure 20.)
Table 8
Fixed Values in Easy Mode
Reg. No.
Register Name
Fixed Value (Decimal)
R9
R10
R11
R18
R19
R20
R21
R22
Maximum raster address
Cursor start raster
Cursor end raster
Horizontal virtual screen width
Multiplexing duty ratio (H)
Multiplexing duty ratio (L)
Display start raster
Mode register
7
6
7
Same value as (R1)
99 (in dual screen mode)
199 (in single screen mode)
0
0
ABC
Up panel
Down panel
Characters are continuous in spite
of the break of a screen.
Figure 20 Example of the Display in the Character Mode
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