 |
поискавой системы для электроныых деталей |
|
|
поискавой системы для электроныых деталей |
|
HT6230 датащи(PDF) 5 Page - Holtek Semiconductor Inc |
|
|
|||||||||||||||||||||||||||||
HT6230 датащи(HTML) 5 Page - Holtek Semiconductor Inc |
|
|
5 / 8 page  HT6230 5 April 19, 2000 Functional Description Key operation When MS is low, the legal key operation is that only one ZIN or XIN can be connected to one DRS driver and if more than one XIN, ZIN or both are pressed at the same time then the key operation is recognized as illegal; hence, the os- cillator will not start. When MS is high, the le- gal key operation is that exactly one ZIN and one XIN are connected to two DRS drivers and other cases of key operation are all considered as illegal. However, when one XIN or ZIN is connected to more than one DRS, the last key scan driver is to generate output data code. Format of transmission code The output pin CODE transmits the data code as a code format, as shown at the bottom figure. The method of transmitting one code bit is called biphase transmission and is represented by the following fig: Where one code bit time is 3´2 8´TOSC. The out- put signal of the MCODE pin is the signal of the generated output code modulated by 1/12 of the system frequency with 1/4 duty cycle. In quies- cent state both CODE and MCODE are high impedance. Key scan drivers The key scan drivers DRS0 to DRS7 are open drain NMOS and the outputs of these are all low in quiescent state. When a legal key opera- tion is detected, the debounce cycle starts and at the end of the debounce cycle, the DRS out- puts are high impedance. Furthermore, the scanning cycle starts and DRS outputs take turns to switch to low state. Programmable output data code The output data code corresponding to each key is programmable by hardware mask option. The PAL circuit is necessary for this purpose. Operation mode · One-key system mode The device enters this mode by switching the MS input pin to low state. The pull-high resis- tors are connected to all XIN and ZIN inputs so that all sense inputs are at high state, until pulled to low state by key operation. In this mode the legal key operation is that only one ZIN or XIN can be connected to one DRS. When a sense input detects a low level, an en- able signal is generated to latch the system or command latches. If the sense input belongs to ZIN, the corresponding system code is gen- erated and the command code is defined as all MS B 1 1 LS B MS B LS B C ode 1 C ode 2 st a r t st a r t 16 b i t - t i m e R epet i t i o n t i m e ( 64 b i t - t i m e) 48 b i t - t i m e 16 b i t - t i m e one c ode D ebounc e cycl e ( 16 bi t - t i m e ) Sc a n cycl e St a r t bi t s C ont r o l bi t 5 syst e m b i t s 6 c o m m a n d b i t s Transmission code format l ogi c 0 l ogi c 1 |
|
|
ссылки URL |
| Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | Ссылка на техническое описание | обмен ссыками | поиск по производителю All Rights Reserved©Alldatasheet.com |
| 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 Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Russian ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
