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HCS410-SN Datasheet(PDF) 10 Page - Microchip Technology |
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HCS410-SN Datasheet(HTML) 10 Page - Microchip Technology |
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10 / 36 page  HCS410 DS40158E-page 10 Preliminary 2001 Microchip Technology Inc. 2.3 Code Hopping Mode Special Features 2.3.1 CODE WORD COMPLETION Code word completion is an automatic feature that ensures that the entire code word is transmitted, even if the button is released before the transmission is com- plete. The HCS410 encoder powers itself up when a button is pushed and powers itself down after the com- mand is finished (Figure 2-7). If MTX3 is set in the con- figuration word, a minimum of three transmissions will be transmitted when the HCS410 is activated, even if the buttons are released. If less than seven words have been transmitted when the buttons are released, the HCS410 will complete the current word. If more than seven words have been transmitted, and the button is released, the PWM out- put is immediately switched off. 2.3.2 CODE WORD BLANKING ENABLE Federal Communications Commission (FCC) part 15 rules specify the limits on fundamental power and harmonics that can be transmitted. Power is calculated on the worst case average power transmitted in a 100ms window. It is therefore advantageous to minimize the duty cycle of the transmitted word. This can be achieved by minimizing the duty cycle of the individual bits and by blanking out consecutive words. Code Word Blanking Enable (CWBE) is used for reducing the average power of a transmission (Figure 2-12). Using the CWBE allows the user to transmit a higher amplitude transmission if the transmission length is shorter. The FCC puts constraints on the average power that can be transmitted by a device, and CWBE effectively prevents continuous transmission by only allowing the transmission of every second or fourth word. This reduces the average power transmitted and hence, assists in FCC approval of a transmitter device. The HCS410 will either transmit all code words, 1 in 2 or 1 in 4 code words, depending on the baud rate selected and the code word blanking option. See Section 3.7 for additional details. 2.3.3 CRC (CYCLE REDUNDANCY CHECK) BITS The CRC bits are calculated on the 65 previously trans- mitted bits. The CRC bits can be used by the receiver to check the data integrity before processing starts. The CRC can detect all single bit and 66% of double bit errors. The CRC is computed as follows: EQUATION 2-1: CRC CALCULATION and with and Din the nth transmission bit 0 ð n ð 64 FIGURE 2-12: CODE WORD BLANKING ENABLE CRC 1 [] n 1 + CRC 0 [] n Di n ⊕ = CRC 0 [] n 1 + CRC 0 [] n Di n ⊕ () CRC 1 [] n ⊕ = CRC 10 , [] 0 0 = One Code Word CWBE Disabled (All words transmitted) CWBE Enabled (1 out of 2 transmitted) A 2A Amplitude CWBE Enabled (1 out of 4 transmitted) 4A Time •Patents have been applied for. |
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