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HCS412TSN Datasheet(PDF) 10 Page - Microchip Technology |
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HCS412TSN Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 44 page  HCS412 DS41099C-page 10 Preliminary © 2002 Microchip Technology Inc. FIGURE 3-2: CODE WORD ORGANIZATION 3.2.1 QUEUE COUNTER (QUE) The QUE counter can be used to request secondary decoder functions using only a single transmitter but- ton. Typically a decoder must keep track of incoming transmissions to determine when a double button press occurs, perhaps an unlock all doors request. The QUE counter removes this burden from the decoder by counting multiple button presses. The 2-bit QUE counter is incremented each time an active button input is released for at least the Debounce Time (TDBR), then reactivated (button pressed again) within the Queue Time (TQUE). The counter increments up from 0 to a maximum of 3, returning to 0 only after a different button activation or after button activations spaced greater than the Queue Time (TQUE) apart. The current transmission aborts, after completing the minimum number of code words (Section 3.4.1), when the active button input is released. A button re-activa- tion within Queue Time (TQUE) then initiates a new transmission (new synchronization counter, encrypted data) using the updated QUE value. Figure 3-3 shows the timing diagram to increment the queue counter value. FIGURE 3-3: QUE COUNTER TIMING DIAGRAM VLOW 1-Bit Fixed Code Portion (37 Bits) QUE 2 Bits CRC 2 Bits VLOW 1-Bit SER 1 Most Sig 16 Bits SER 0 Least Sig 16 Bits BUT 4 Bits Counter Overflow 2 Bits DISCRIM 10 Bits Synchronization 16 Bits Counter 15 0 S2 S1 S0 LC0 OVR1 OVR0 Hopping Code Portion Message (32 Bits) Q1 Q0 C1 C0 MSb LSb 69 Data bits Transmitted LSb first. 32-bit Serial Number (XSER = 1) Fixed Code Portion (37 Bits) QUE 2 Bits CRC 2 Bits BUT 4 Bits S2 S1 S0 LC0 SER 0 Least Sig16 Bits BUT 4 Bits Counter Overflow 2 Bits DISCRIM 10 Bits Synchronization 16 Bits Counter 15 0 S2 S1 S0 LC0 OVR1 OVR0 Hopping Code Portion Message (32 Bits) Q1 Q0 C1 C0 MSb LSb 69 Data bits Transmitted LSb first. SER 1 12 MSb’s 28-bit Serial Number (XSER = 0) Shaded data included in CRC calculation Input Sx Code Words Transmitted 1st Button Press All Buttons Released 2nd Button Press QUE1:0 = 002 Synch CNT = X QUE1:0 = 012 Synch CNT = X+1 t2 = 0 t1 > TDBP t1 = 0 TDBR < t < TQUE |
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