UPSD325X datasheet(94/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

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Table 71. USB Endpoint1 (and 2) Transmit Control Register (UCON1: 0EBh)

Table 72. Description of the UCON1 Bits

76543210

TSEQ1

EP12SEL

TX1E

FRESUM

TP1SIZ3

TP1SIZ2

TP1SIZ1

TP1SIZ0

Bit

Symbol

R/W

Function

TSEQ1

R/W

Endpoint 1/ Endpoint 2 Transmit Data Packet PID. (0=DATA0, 1=DATA1)

This bit determines which type of data packet (DATA0 or DATA1) will be

sent during the next IN transaction directed to Endpoint 1 or Endpoint 2.

Toggling of this bit must be controlled by software. RESET clears this bit.

EP12SEL

R/W

Endpoint 1/ Endpoint 2 Transmit Selection. (0=Endpoint 1, 1=Endpoint 2)

This bit specifies whether the data inside the registers UDT1 are used for

Endpoint 1 or Endpoint 2. If all the conditions for a successful Endpoint 2

USB response to a hosts IN token are satisfied (TXD1F=0, TX1E=1,

STALL2=0, and EP2E=1) except that the EP12SEL Bit is configured for

Endpoint 1, the USB responds with a NAK handshake packet. RESET

clears this bit.

TX1E

R/W

Endpoint1 / Endpoint2 Transmit Enable.

This bit enables a transmit to occur when the USB Host Controller send

an IN token to Endpoint 1 or Endpoint 2. The appropriate endpoint

enable bit, EP1E or EP2E Bit in the UCON2 register, should also be set.

Software should set the TX1E Bit when data is ready to be transmitted. It

must be cleared by software when no more data needs to be transmitted.

If this bit is ’0’ or TXD1F is set, the USB will respond with a NAK

handshake to any Endpoint 1 or Endpoint 2 directed IN token.

RESET clears this bit.

FRESUM

R/W

Force Resume.

This bit forces a resume state (“K” on non-idle state) on the USB data

lines to initiate a remote wake-up. Software should control the timing of

the forced resume to be between 10ms and 15ms. Setting this bit will not

cause the RESUMF Bit to set.

3 to 0

TP1SIZ3 to

TP1SIZ0

R/W

The number of transmit data bytes. These bits are cleared by RESET.

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