M68HC08 datasheet(172/288 Pages) FREESCALE

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Universal Serial Bus Module (USB)

Data Sheet

MC68HC908BD48 — Rev. 2.1

172

Universal Serial Bus Module (USB)

Freescale Semiconductor

RX0E — Endpoint 0 Receive Enable

This bit is set to enable data packet reception from endpoint 0.

Software should set this bit when it is ready for data packet reception.

It must be cleared when data cannot be received. If RX0E "0" or RBFF

is "1", a NAK handshake will be returned for the next OUT token.

Reset clears this bit.

1 = Data is read to be received on endpoint 0

0 = Not ready for data; respond with NAK

TP0SIZ[3:0] — Endpoint 0 Transmit Data Size

The TP0SIZ[3:0] is used to store the number of transmit data bytes

from endpoint 0. The default size of transmit data is "0" after reset.

13.5.5 USB Control Register 1 (UCR1)

T1SEQ — Endpoint 1/2 Data Packet PID Select

This bit will determine the transmit data packet PID of endpoint 1/2.

When it is "0", the DATA0 PID (b0011) will be sent. When it is "1", the

DATA1 PID (b1011) will be sent. Reset clears this bit.

1 = DATA1 PID will be sent on endpoint 1/2

0 = DATA0 PID will be sent on endpoint 1/2

ENDADD — Endpoint Address Select

This bit specifies the which endpoint (1 or 2) uses the eight data

registers, UD1R0–UD1R7, for data transmit buffers. Clearing this bit

selects endpoint 1 to use the data registers. Setting this bit selects

endpoint 2 to use the data registers.

Address:

$002F

Bit 7

654321

Bit 0

Read:

T1SEQ

ENDADD

TX1E

FRESUM TP1SIZ3 TP1SIZ2 TP1SIZ1 TP1SIZ0

Write:

Reset:

00000000

Figure 13-5. USB Control Register 1 (UCR1)

M68HC08 Datasheet(PDF) 172 Page - Freescale Semiconductor, Inc

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