Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ML9092-02 Datasheet(PDF) 43 Page - List of Unclassifed Manufacturers

Part No. ML9092-02
Description  LCD Driver with Key Scanner and RAM
Download  66 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  ETC2 [List of Unclassifed Manufacturers]
Homepage  
Logo 

ML9092-02 Datasheet(HTML) 43 Page - List of Unclassifed Manufacturers

Zoom Inzoom in Zoom Outzoom out
 43 / 66 page
background image
FEDL9092-01
LAPIS Semiconductor
ML9092-01/02/03/04
43/66
Key Scan
The key scanning starts when a key switch is pressed on and ends after all key switches are detected to be off.
After the key switch is turned on, when the same key is pressed for two cycles or more, the level of the KREQ
signal changes from a “L” to “H” level. In the same manner, the level of the KREQ signal changes from “H” to
“L” two cycles after all key switches are turned off.
This signal can be used as a flag. To use it as a flag, start key-scan reading when the KREQ signal has changed
from “L” to “H.”
While the KREQ signal is at a “H” level, carry out key-scan reading periodically. Carry out key scan reading also
when the KREQ signal has changed from “H” to “L”.
The KREQ signal (the KREQ signal that is sent when the key switch is turned on) is reset when all key switches are
detected to be off or when a “L” level is applied to the
RESET pin.
Scanning stops
Key switch OFF
Key data reading
starts
Key switch ON.
Scanning starts.
KREQ
Key switch
R0/C0
R1/C1
R2/C2
R3/C3
R4/C4
Notes:
1.
Even when the KREQ signal changes from “L” to “H”, chattering for more than one key scan cycle is
not absorbed. This should be handled by multiple data reads by software.
2.
How simultaneous depression of two keys is processed should be handled by software.
3.
When three or more key switches are pressed at the same time, the device may recognize that
key(s) that has not been actually pressed has been pressed. Therefore, to recognize simultaneous
depression of three or more key switches, add a diode in series to each key (see Figures 1 and 2).
To ignore simultaneous depression of three or more key switches, a program may be required to
ignore all key data which contains three or more consecutive “1” values.


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64  65  66 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn