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UPD360 bảng dữ liệu(PDF) 137 Page - Microchip Technology

tên linh kiện UPD360
Giải thích chi tiết về linh kiện  Highly Integrated Small Form Factor USB Type-C??Power Delivery 2.0 Port Controller
PDF  221 Pages
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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UPD360 bảng dữ liệu(HTML) 137 Page - Microchip Technology

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 2016-2017 Microchip Technology Inc.
DS00002084C-page 137
UPD360
11.4.1.7
TX Parameters Register B (TX_PARAM_B)
11.4.1.8
TX Bit-Time Count Register (TX_BITTIME_CNT)
Address:
1A06h
Size:
8 bits
Bits
Description
Type
Default
7
RESERVED
RO
-
6:0
PREAMBLE_LEN
Number of preamble bits to send.
Range: 1-127, specification: 64d (default)
A value of 0 is invalid and hardware does not check for validity. Software
should use the default value for normal operation.
Setting this field to an odd value will cause violation of the USB PD Specifica-
tion which states “The preamble shall start with a “0” and shall end with a “1”.”
An odd value will cause preamble to start with a value of “0” but it will also end
in a value of “0.” This may or may not lead to functional issues. This field
should be set to an even value to remain spec compliant.
R/W
1000000b
Address:
1A07h
Size:
8 bits
Bits
Description
Type
Default
7:0
BIT_TIME_CNT
Bit-time counter value. The TX logic uses this value to determine the bit-time
for transmission (nominal bit rate is 300Kbps). This register can be used to
adjust bit-time for testing purpose (adjusting bitrate).
Count value is based on clock frequency and is given by:
((Clock Freq KHz / Bit Rate Kbps) - 1)
i.e.,
Clock Frequency = 48000KHz (48MHz)
Nominal Bit Rate = 300 Kbps
BIT_TIME_CNT = (48000 / 300) - 1 = 159
R/W
00h



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