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參數(shù)資料
| 型號(hào)： | HT1647(100QFP)A |
| 英文描述： | Controller Miscellaneous - Datasheet Reference |
| 中文描述： | 控制器雜項(xiàng)-數(shù)據(jù)表參考 |
| 文件頁(yè)數(shù)： | 10/22頁(yè) |
| 文件大?。?/td> | 201K |
| 代理商： | HT1647(100QFP)A |
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HT1647
Rev. 1.00
10
June 1, 2001
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Display memory - RAM structure
Display memory
RAM structure
The static display RAM is organized into 512 4
bits and stores the display data. Two bits of
RAM are mapped to an LCD s one pixel and
then determines whether 4-level gray scale or
4-color display concurrently. The contents of
the RAM are directly mapped to the contents of
the LCD driver. Data in the RAM can be ac-
cessed
by
the
READ,
READ-MODIFY-WRITE commands. The fol-
lowing is a mapping from the RAM to the LCD
patterns.
WRITE
and
Gray scale level decision
HT1647 uses PWM technique to provide 4-level
gray scale display. Two bits of RAM data code
((D3, D2) or (D1, D0)) decide one pixel level of
LCDs, level 1~level divided by 4. Every level
must be definedasonekindofgrayscalebyPWM
data (namely B4~B0) previously.
RAM data code
(D3, D2) or (D1, D0)
Choice Gray Scale
Level
(1, 1)
Level 1
(1, 0)
Level 2
(0, 1)
Level 3
(0, 0)
Level 4
RAM data defined gray scale level
Frame frequency
HT1647 provides two kinds of frame frequency
option by command code; 89Hz and 170Hz re-
spectively. FRAME 89Hz provides 89Hz frame
frequencyandactivesegmentsignalwidthcanbe
divided into 24 sections concurrently. FRAME
170Hz provides 170Hz frame frequency and ac-
tive segment signal width can be divided into 13
sections concurrently. The 24 sections display a
particularly gray scale more than the 13 sections
by PWM data. The default is FRAME 89Hz.
Gray scale display
If the user choose 89Hz frame frequency, a
max. of 24 sections can be programmed to suit a
satisfactory gray scale in every level. Similarly,
if the user choose 170Hz frame frequency, a
max. of 13 sections can be programmed to suit a
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