STW4810CHDRLF datasheet(43/78 Pages) STMICROELECTRONICS

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STw4810

Functional description

43/78

The transceiver receives USB data in the following conditions:

uart_en = 0 (USB control register 1); oe_int_en = 1

UART mode

UART mode is entered by setting the ‘uart_en’ bit to 1 (USB control register 1 -

Table 11).

The transceiver contains two digital logic level translators between the following balls:

●

TXD signal: from USBVM to DN

●

RXD signal: from DP to USBVP

When not in UART mode the level translators are disabled.

Table 33.

Data receiver via USB control register 1

USB mode (dat_se0)

Suspend

Inputs

Outputs

USBVP

USBVM

USBRCV

1 (DAT_SE0 mode)

Diff rcv 1

not used

1 (DAT_SE0 mode)

not used

1 (DAT_SE0 mode)

not used

1 (DAT_SE0 mode)

Diff rcv 1

not used

1 (DAT_SE0 mode)

not used

1 (DAT_SE0 mode)

not used

1 (DAT_SE0 mode)

not used

1 (DAT_SE0 mode)

not used

0 (VP_VM mode)

diff rcv 1

0 (VP_VM mode)

diff rcv 1

0 (VP_VM mode)

not used

0 (VP_VM mode)

not used

0 (VP_VM mode)

not used

0 (VP_VM mode)

not used

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