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The 212 decoders are a series of CMOS LSIs for remotecontrol system applicaTIons. They are paired withHolteks 212 series of encoders (refer to the encoder/decodercross reference table). For proper operaTIon, apair of encoder/decoder with the same number of addressesand data format should be chosen.The decoders receive serial addresses and data from aprogrammed 212 series of encoders that are transmittedby a carrier using an RF or an IR transmission medium.They compare the serial input data three TImes conTInuouslywith their local addresses. If no error or unmatchedcodes are found, the input data codes aredecoded and then transferred to the output pins. The VTpin also goes high to indicate a valid transmission.The 212 series of decoders are capable of decodinginformations that consist of N bits of address and 12Nbits of data. Of this series, the HT12D is arranged to provide8 address bits and 4 data bits, and HT12F is used todecode 12 bits of address information.
