ST7263BEx datasheet(104/186 Pages) STMICROELECTRONICS

104 / 186 page

On-chip peripherals

ST7263Bxx

104/186

Doc ID 7516 Rev 8

Endpoint n register A (EPnRA)

These registers (EP0RA, EP1RA and EP2RA) are used for controlling data transmission.

They are also reset by the USB bus reset.

Note:

Endpoint 2 and the EP2RA register are not available on some devices (see device feature

list and register map).

Reset value: 0000 xxxx (0xh)

ST_

OUT

DTOG

_TX

STAT

_TX1

STAT

_TX0

TBC3

TBC2

TBC1

TBC0

Read.write

7 ST_OUT Status out.

This bit is set by software to indicate that a status out packet is expected: in this

case, all nonzero OUT data transfers on the endpoint are STALLed instead of being

ACKed. When ST_OUT is reset, OUT transactions can have any number of bytes,

as needed.

6 DTOG_TX Data Toggle, for transmission transfers.

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

transmitted data packet. This bit is set by hardware at the reception of a SETUP

PID. DTOG_TX toggles only when the transmitter has received the ACK signal from

the USB host. DTOG_TX and also DTOG_RX (see EPnRB) are normally updated

by hardware, at the receipt of a relevant PID. They can be also written by software.

[5:4] STAT_TX[1:0] Status bits, for transmission transfers.

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

Table 34.

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

correct transfer has occurred (CTR=1) related to a IN or SETUP transaction

addressed to this endpoint; this allows the software to prepare the next set of data

to be transmitted.

[3:0] TBC[3:0] Transmit byte count for Endpoint n.

Before transmission, after filling the transmit buffer, software must write in the TBC

field the transmit packet size expressed in bytes (in the range 0-8).

Caution: Any value outside the range 0-8 willinduce undesired effects (such as

continuous data transmission).

Table 34.

STAT_TX bit definition

STAT_TX1

STAT_TX0

Meaning

DISABLED: transmission transfers cannot be

executed.

STALL: the endpoint is stalled and all transmission

requests result in a STALL handshake.

NAK: the endpoint is naked and all transmission

requests result in a NAK handshake.

VALID: this endpoint is enabled for transmission.

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