9.4.6 USB HUB Interrupt Register 0 (HIR0)

Address:

Read:

Write:

Reset:

$0059

 

 

 

 

 

 

 

Bit 7

6

5

4

3

2

1

Bit 0

 

 

 

 

 

 

 

 

TXDF

RXDF

0

0

TXDIE

RXDIE

0

0

 

 

 

 

 

 

 

 

 

 

TXDFR

RXDFR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

0

 

= Unimplemented

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 9-7. USB HUB Interrupt Register 0 (HIR0)

TXDF — HUB Endpoint 0 Data Transmit Flag

This read only bit is set after the data stored in HUB Endpoint 0 transmit buffers has been sent and an ACK handshake packet from the host is received. Once the next set of data is ready in the transmit buffers, software must clear this flag by writing a logic 1 to the TXDFR bit. To enable the next data packet transmission, TXE must also be set. If TXDF bit is not cleared, a NAK handshake will be returned in the next IN transaction.

Reset clears this bit. Writing to TXDF has no effect. 1 = Transmit on HUB Endpoint 0 has occurred

0 = Transmit on HUB Endpoint 0 has not occurred

RXDF — HUB Endpoint 0 Data Receive Flag

This read only bit is set after the USB HUB function has received a data packet and responded with an ACK handshake packet. Software must clear this flag by writing a logic 1 to the RXDFR bit after all of the received data has been read. Software must also set RXE bit to one to enable the next data packet reception. If RXDF bit is not cleared, a NAK handshake will be returned in the next OUT transaction.

Reset clears this bit. Writing to RXDF has no effect. 1 = Receive on HUB Endpoint 0 has occurred

0 = Receive on HUB Endpoint 0 has not occurred

Advance Information

MC68HC(7)08KH12 Rev. 1.1

 

 

128

Freescale Semiconductor

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Freescale Semiconductor MC68HC08KH12 manual USB HUB Interrupt Register 0 HIR0, 128

MC68HC08KH12 specifications

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