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HT6030 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT6030 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
6 / 10 page 312 Series of Decoders 6 December 13, 1999 Functional Description Operation The 312 series of decoders provide various com- binations of address and data pins in different packages. They are paired with 312series of encoders. The decoders receive data transmit- ted by the encoders and interpret the first N bits of the code period as addresses and the last 12-N bits as data (where N is the address code number). A signal on the DIN pin then acti- vates the oscillator which in turn decodes the incoming address and data. The decoders check the received address twice continuously. If all the received address codes match the contents of the decoder¢s local address, the 12-N bits of data are decoded to activate the output pins and the VT pin is set high indicating a valid transmission. That will last until the address code is incorrect or no signal is received. The output of the VT pin is high only when the transmission is valid. Otherwise it is always low. Output type The data outputs follow the encoders during a valid transmission and are then latched in this state until the next valid transmission occurs. Flowchart 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 pin should be kept ²low² if there is no signal input. Ye s Are 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 Addr 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 & ac t i v a t e V T Addr es s bi t s m a t c hed ? Ma t c h pr ev i ous l y s t o r e d dat a ? 2 t i m e s of c hec k i ng c o m p l e t ed ? Po w e r o n |
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