HT12A Holtek Semiconductor Inc, HT12A Datasheet - Page 6

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

HT12A/HT12E
Functional Description
Operation
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The 2
series of encoders begin a 4-word transmission cycle upon receipt of a transmission enable
(TE for the HT12E or D8~D11 for the HT12A, active low). This cycle will repeat itself as long as the
transmission enable (TE or D8~D11) is held low. Once the transmission enable returns high the en-
coder output completes its final cycle and then stops as shown below.
Transmission timing for the HT12E
Transmission timing for the HT12A (L/MB=Floating or VDD)
Transmission timing for the HT12A (L/MB=VSS)
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April 11, 2000