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HT6P20 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT6P20 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
6 / 9 page Normal operation The HT6P20 encodes and transmits address/data to a decoder upon receipt of a trigger signal. The address codes of the HT6P20A are always transmitted as long as power (VDD) is supplied. The trans- mission function of the HT6P20B/D is enabled by the D0~D7 pins (active low). The following is the transmission timing of the HT6P20: A complete code word of the HT6P20D consists of 3 periods as shown below. The HT6P20A/B/D detects the logic state of the internal programmed address and the external data pins, and then transmits the detected information during the code period. Each address/data bit can be set to one of the following two logic states: HT6P20 6 May 2, 2000 " O ne" " Z er o" f o sc A ddr es s / Da t a b i t ant i - c ode p e r i od (4 b i t s ) p ilo t p e r io d ( 2 3 cl o cks) addr es s c ode per i o d dat a c ode p e r i od 1/3 b i t ( A 0 ~ A 19 , 6 0 cl o cks) ( D 3 ~ D 0 , 12 cl o cks) 00 11 fo s c DO UT 1 c l o c k A complete code word for the HT6P20D E n c oder DO UT < 1 w or d D 0 ~ D 7 > 1 w or d Transmission timing |
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