ST7263BEx datasheet(105/186 Pages) STMICROELECTRONICS

105 / 186 page

ST7263Bxx

On-chip peripherals

Doc ID 7516 Rev 8

105/186

Endpoint n register B (EPnRB)

These registers (EP1RB and EP2RB) are used for controlling data reception on Endpoints 1

and 2. They are also reset by the USB bus reset.

Note:

Endpoint 2 and the EP2RB register are not available on some devices (see device feature

list and register map).

Reset value: 0000 xxxx (0xh)

CTRL

DTOG

_RX

STAT

_RX1

STAT

_RX0

EA3

EA2

EA1

EA0

Read.write

7 CTRL Control.

This bit should be 0.

Note: If this bit is 1, the Endpoint is a control endpoint. (Endpoint 0 is always a

control Endpoint, but it is possible to have more than one control Endpoint).

6 DTOG_RX Data toggle, for reception transfers.

It contains the expected value of the toggle bit (0=DATA0, 1=DATA1) for the next

data packet. This bit is cleared by hardware in the first stage (Setup Stage) of a

control transfer (SETUP transactions start always with DATA0 PID). The receiver

toggles DTOG_RX only if it receives a correct data packet and the packet’s data

PID matches the receiver sequence bit.

[5:4] STAT_RX [1:0] Status bits, for reception transfers.

These bits contain the information about the endpoint status, which are listed in

Table 35.

These bits are written by software. Hardware sets the STAT_RX bits to NAK when a

correct transfer has occurred (CTR=1) related to an OUT or SETUP transaction

addressed to this endpoint, so the software has the time to elaborate the received

data before acknowledging a new transaction.

[3:0] EA[3:0] Endpoint address.

Software must write in this field the 4-bit address used to identify the transactions

directed to this endpoint. Usually EP1RB contains “0001” and EP2RB contains

“0010”.

Table 35.

STAT_RX bit definition

STAT_RX1

STAT_RX0

Meaning

DISABLED: reception transfers cannot be

executed.

STALL: the endpoint is stalled and all reception

requests result in a STALL handshake.

NAK: the endpoint is naked and all reception

requests result in a NAK handshake.

VALID: this endpoint is enabled for reception.

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