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HCS362 bảng dữ liệu(PDF) 15 Page - Microchip Technology

tên linh kiện HCS362
Giải thích chi tiết về linh kiện  Memory Programming Specification
PDF  28 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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HCS362 bảng dữ liệu(HTML) 15 Page - Microchip Technology

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 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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