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HT12D Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT12D Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 9 page  212 Series of Decoders 5 July 12, 1999 Functional Description Operation The 2 12 series of decoders provides various com- binations of addresses and data pins in differ- ent packages so as to pair with the 2 12 series of encoders. The decoders receive data that are transmitted by an encoder and interpret the first N bits of 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 activates the oscillator which in turn decodes the incoming address and data. The decoders will then check the re- ceived address three times continuously. If the received address codes all 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 to indicate a valid transmission. This will last unless 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 Of the 2 12 series of decoders, the HT12F has no data output pin but its VT pin can be used as a momentary data output. The HT12D, on the other hand, provides 4 latch type data pins whose data remain unchanged until new data are received. Part No. Data Pins Address Pins Output Type Operating Voltage HT12D 4 8 Latch 2.4V~12V HT12F 0 12 ¾ 2.4V~12V Flowchart The oscillator is disabled in the standby state and activated when a logic ²high² signal applies to the DIN pin. That is to say, the DIN should be kept low 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 dat a to o u t pu t & 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 e v i ous s t o r e d dat a ? Po w e r o n 3 t i m e s of c hec k i ng c o m pl e t ed ? |
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