ST7263BEx datasheet(100/186 Pages) STMICROELECTRONICS

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On-chip peripherals

ST7263Bxx

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Doc ID 7516 Rev 8

PID register (PIDR)

Reset value: xx00 0000 (x0h)

TP3

TP2

000

RX_

SEZ

RXD

Read only

[7:6] TP[3:2] Token PID bits 3 & 2.

USB token PIDs are encoded in four bits. TP[3:2] correspond to the variable token

PID bits 3 & 2.

: PID bits 1 & 0 have a fixed value of 01.

Note: When a CTR interrupt occurs (see register ISTR) the software should read

the TP3 and TP2 bits to retrieve the PID name of the token received.

The USB standard defines TP bits (see Table 33).

[5:3] Reserved. Forced by hardware to 0.

2 RX_SEZ Received single-ended zero

This bit indicates the status of the RX_SEZ transceiver output.

0: No SE0 (single-ended zero) state

1: USB lines are in SE0 (single-ended zero) state

1 RXD Received data

0: No K-state

1: USB lines are in K-state

This bit indicates the status of the RXD transceiver output (differential receiver

output).

If the environment is noisy, the RX_SEZ and RXD bits can be used to secure the

application. By interpreting the status, software can distinguish a valid End

Suspend event from a spurious wakeup due to noise on the external USB line. A

valid End Suspend is followed by a Resume or Reset sequence. A Resume is

indicated by RXD=1, a Reset is indicated by RX_SEZ=1.

0 Reserved. Forced by hardware to 0.

Table 33.

TP bit definition

TP3

TP2

PID Name

OUT

SETUP

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