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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT614 датащи(PDF) 5 Page - Holtek Semiconductor Inc |
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HT614 датащи(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 9 page  HT604L/614/692 5 April 24, 2000 Functional Description Operation The 318 series of decoders provide various com- binations of address and data pins in different packages. It is paired with the 318 series of encoders. The decoders receive data transmit- ted by the encoders and interpret the first N bits of the code period as address and the last 18-N bits as data (where N is the address code number). A signal on the DIN pin then acti- vates the oscillator which in turns decodes the incoming address and data. The decoders will check the received address twice continuously. If all the received address codes match the con- tents of the decoder¢s local address, the 18-N bits of data are decoded to activate the output pins, and the VT pin is set high to indicate a valid transmission. That will last until the ad- dress code is incorrect or no signal has been re- ceived. The output of the VT pin is high only when the transmission is valid. Otherwise it is always low. Output type There are two types of output to select from: · Momentary type The data outputs follow the encoder during a valid transmission and then reset. · Latch type The data outputs follow the encoder during a valid transmission, and are then latched in this state until the next valid transmission occurs. Flowchart Note: The oscillator is disabled in the standby state and activated as long as a logic ²high² signal is applied to the DIN pin. i.e., the DIN should be kept ²low² if there is no signal input. Ye s C ode i n ? S t or e dat a No Ye s No No No Ye s S t andby m ode D i s abl e V T & i gnor e t h e r e s t o f th i s w o r d Ye s No Ye s A ddr es s or dat a er r o r ? Lat c h / M om ent a r y dat a t o o ut put & a c ti v a t e V T A ddr es s bi t s m a t c hed ? Ma t c h pr ev i ous s t o r e d dat a ? 2 t i m es of c hec k i ng c o m p l e t ed ? Po w e r o n |
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