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參數(shù)資料
| 型號： | HD66728 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 112 x 80-dot Graphics LCD Controller/Driver(112 x 80點(diǎn)圖形LCD控制器) |
| 中文描述： | 112 × 80點(diǎn)圖形LCD控制器/驅(qū)動器（112 × 80點(diǎn)圖形液晶顯示控制器） |
| 文件頁數(shù)： | 64/138頁 |
| 文件大小： | 2158K |
| 代理商： | HD66728 |
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HD66728
64
Key Scan Control
The key matrix scanner senses and holds the key states at each rising edge of key strobe signals (KST) that
are output by the HD66728. The key strobe signals are output as time-multiplexed signals from KST0 to
KST3. After passing through the key matrix, these strobe signals are used to sample the key state of eight
inputs KIN0 to KIN7, enabling up to 32 keys to be scanned.
The states of inputs KIN0 to KIN7 are sampled by key strobe signal KST0 and latched into the SCAN0
register. Similarly, the data sampled by strobe signals KST1 to KST3 is latched into the SCAN1 to SCAN3
registers, respectively. Key pressing is stored as 1 in these registers.
The generation cycle and pulse width of the key strobe signals depend on the operating frequency
(oscillation frequency) of the HD66728 and the key scan cycle determined by the KF0 and KF1 bits. For
example, when the operational frequency is 80 kHz and KF0 and KF1 are both 10, the generation cycle is
3.2 ms and the pulse width is 0.8 ms. When the operating frequency (oscillation frequency) is changed, the
above generation cycle and the pulse width are changed in inverse proportion.
In order to compensate for the mechanical features of the keys, such as chattering and noise and for the
key-strobe generation cycle and the pulse width of the HD66728, software should read the scanned data
two to three times in succession to obtain valid data. Multiple keypress combinations should also be
processed in the software.
Up to three keys can be pressed simultaneously. Note, however, that if the third key is pressed on the
intersection between the rows and columns of the first two keys pressed, incorrect data will be sampled. For
three-key input, the third key must be on a separate column or row.
Additionally, the HD66728 supports the key standby mode in which only the key scan circuit enters the
standby state. When 1 is set to the key standby mode setting bit (KSB), only key scanning is stopped. In
this case, as well as in the normal standby mode, the key scan interrupt function can be used. For example,
this function is used when only key scanning is stopped to improve the sensitivity of the wave received by a
radio system during calling.
The input pins KIN0 to KIN7 are pulled up to V
CC
with internal MOS transistors (see the Electrical
Characteristics section). External resistors may also be required to further pull the voltages up when the
internal pull-ups are insufficient for the desired noise margins or for a large key matrix.
SCAN0
SCAN1
SCAN2
SCAN3
D
03
D
02
D
01
D
00
D
13
D
12
D
11
D
10
D
23
D
22
D
21
D
20
D
33
D
32
D
31
D
30
KIN3 KIN2 KIN1 KIN0
(KST0
↑
)
(KST1
↑
)
(KST2
↑
)
(KST3
↑
)
D
04
D
14
D
24
D
34
KIN4
D
05
D
15
D
25
D
35
KIN5
D
06
D
16
D
26
D
36
KIN6
D
07
D
17
D
27
D
37
KIN7
KSD7KSD6 KSD5KSD4 KSD3KSD2 KSD1KSD0
Figure 30 Key Scan Register Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| HD66730 | Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動器) |
| HD66731 | Dot-Matrix Liquid Crystal Display Controller/Driver(點(diǎn)陣液晶顯示控制器/驅(qū)動器) |
| HD66731A00TB0L | 122 x 32 pixel format, Compact LCD size |
| HD66731A00TA0L | Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
| HD66731A01TA0L | Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD66729 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:128 x 128-dot Graphics LCD Controller/Driver with Four-grayscale Functions |
| HD66730 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
| HD66730A00FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
| HD66730A01FS | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
| HD66731 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Dot-Matrix Liquid Crystal Display Controller/Driver Supporting Japanese Kanji, Korean Font Display |
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