HT12A Holtek Semiconductor Inc, HT12A Datasheet - Page 7

• Manufacturer Part Number: HT12A
• Description: Series of Encoders
• Manufacturer: Holtek Semiconductor Inc

Information word
If L/MB=1 the device is in the latch mode (for use with the latch type of data decoders). When the trans-
mission enable is removed during a transmission, the DOUT pin outputs a complete word and then
stops. On the other hand, if L/MB=0 the device is in the momentary mode (for use with the momentary
type of data decoders). When the transmission enable is removed during a transmission, the DOUT
outputs a complete word and then adds 7 words all with the ²1² data code.
An information word consists of 4 periods as illustrated below.
Address/data waveform
Each programmable address/data pin can be externally set to one of the following two logic states as
shown below.
Address/Data bit waveform for the HT12E
Address/Data bit waveform for the HT12A
Composition of information
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HT12A/HT12E
April 11, 2000