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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HCS361 датащи(PDF) 15 Page - Microchip Technology |
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HCS361 датащи(HTML) 15 Page - Microchip Technology |
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15 / 28 page  2004 Microchip Technology Inc. Preliminary DS41256A-page 15 HCSXXX KEELOQ devices that are capable of oscillator tuning include the HCS201, HCS362, HCS410 and the HCS412. Though, only the HCS201 and HCS412 transmit calibration pulses when polling the chips at the end of write cycles. The other two devices must be tuned according to the preamble pulses that they transmit at the beginning of a data packet. For the best accuracy, use multiple time elements to achieve an average time element value. Typically, a number that is a power of 2n is used in order to simplify the resultant quotient (i.e., 4 or 8). In order to obtain the most accurate time element measurement, the widest possible baud rate should be chosen. For simplifying the two flow diagrams below, a common time element was chosen to the devices that share algorithms. The HCS362 and the HCS410 oscillator tuning register can also be tuned as shown in the algorithm above, but with the caveat that after the device is programmed, the programmer must activate the target device in order to measure the time element in the communication preamble. A typical preamble is shown in Figure 4-3. FIGURE 4-3: PWM CODE WORD TRANSMISSION TIMINGS Preamble = 23 TE Header = 10 TE bit 0 bit 1 TE TE TE TE TE |
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