UPD360 datasheet(137/221 Pages) MICROCHIP

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

RESERVED

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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