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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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UPD360 датащи(PDF) 137 Page - Microchip Technology |
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UPD360 датащи(HTML) 137 Page - Microchip Technology |
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137 / 221 page  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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