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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS365 датащи(PDF) 15 Page - Microchip Technology |
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HCS365 датащи(HTML) 15 Page - Microchip Technology |
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15 / 40 page  © 2011 Microchip Technology Inc. DS41109E-page 15 HCS365 FIGURE 4-3: VARIABLE PULSE WIDTH MODULATION (VPWM) FIGURE 4-4: PULSE POSITION MODULATION (PPM) In addition to the Modulation Format, Guard Time, and Baud Rate, the following options are also available to change the transmission format: • If the START/STOP Pulse Enable (STEN) config- uration option is enabled, the HCS365 will place a leading and trailing ‘1’ on each code word. This is necessary for modulation formats such as Man- chester and PPM to interpret the first and last data bit. • A wake-up sequence can be transmitted before the transmission starts. The wake-up sequence is configured with the Wake-up (WAKE) configura- tion option and can be disabled or set to 50 ms, 75 ms, or 100 ms of pulses as indicated in Figure 4-5. • The WAKE option is the same for both Encoder 1 and Encoder 2. FIGURE 4-5: WAKE-UP ENABLE VPWM BIT ENCODING: TBP on Transition Low to High TBP LOGIC “0” TBP LOGIC “1” TE on Transition High to Low 2XTE TE TBP TE Guard Time 10xTE Header Encrypted Portion Fixed Code Portion 2XTE 31xTE 50% Preamble 1 216 TE TE LOGIC “0” LOGIC “1” LOGIC "1" LOGIC "0" TE TE TE Guard Time Fixed Code Portion Encrypted Portion TBP TBP 31xTE 50% Preamble START bit STOP bit 10xTE Header 1 216 3 X TE WAKE-UP = 75 ms WAKE-UP = 50 ms WAKE-UP = 100 ms WAKE-UP Guard Time = 6.4 ms, 51.2 ms, or 102.4 ms CODE CODE TE TE TE 2TE TE 5TE TG TG |
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