M68HC08 datasheet(171/288 Pages) FREESCALE

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Universal Serial Bus Module (USB)

MC68HC908BD48 — Rev. 2.1

Data Sheet

Freescale Semiconductor

Universal Serial Bus Module (USB)

171

13.5.4 USB Control Register 0 (UCR0)

T0SEQ — Endpoint 0 Data Packet PID Select

This bit will determine the transmit data packet PID of endpoint 0.

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 0

0 = DATA0 PID will be sent on endpoint 0

STALL0 — Endpoint 0 STALL Handshake

This bit is set to generate the STALL handshake packet as next IN or

OUT transactions handshake packet from endpoint 0. The USB

hardware clears the STALL0 bit when a SETUP packet is received.

Reset clears this bit.

1 = Send STALL handshake on endpoint 0

0 = Do not send STALL handshake on endpoint 0

TX0E — Endpoint 0 Transmit Enable

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

Software should set this bit when data is ready for data packet

transmission. It must be cleared when no more data needs to be

transmitted. If TX0E is "0" or TXD0F is "1", a NAK handshake will be

returned for the next IN token. Reset clears this bit.

1 = Data is ready to be sent on endpoint 0

0 = Data is not ready; respond with ACK

Address:

$002B

Bit 7

654321

Bit 0

Read:

T0SEQ

STALL0

TX0E

RX0E

TP0SIZ3 TP0SIZ2 TP0SIZ1 TP0SIZ0

Write:

Reset:

00000000

Figure 13-4. USB Control Register 0 (UCR0)

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