Freescale Semiconductor MC68HC08KH12 User Manual

MC68HC(7)08KH12

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Rev. 1.1

Advance Information

Freescale Semiconductor

145

DRSEQ — Embedded Device Endpoint 0 Receive Sequence Bit

This read only bit indicates the type of data packet last received for 
embedded device Endpoint 0 (DATA0 or DATA1). 

1 = DATA1 Token received in last embedded device Endpoint 0 

receive

0 = DATA0 Token received in last embedded device Endpoint 0 

receive

DSETUP — Embedded Device SETUP Token Detect Bit

This read only bit indicates that a valid SETUP token has been 
received. 

1 = Last token received for Endpoint 0 was a SETUP token
0 = Last token received for Endpoint 0 was not a SETUP token

DTX1ST — Embedded Device Transmit First Flag

This read only bit is set if the embedded device Endpoint 0 Data 
Transmit Flag (TXD0F) is set when the USB control logic is setting the 
embedded device Endpoint 0 Data Receive Flag (RXD0F). In other 
words, if an unserviced Endpoint 0 Transmit Flag is still set at the end 
of an endpoint 0 reception, then this bit will be set. This bit lets the 
firmware know that the Endpoint 0 transmission happened before the 
Endpoint 0 reception. Reset clears this bit.

1 = IN transaction occurred before SETUP/OUT
0 = IN transaction occurred after SETUP/OUT

DTX1STR — Clear Transmit First Flag

Writing a logic 1 to this write only bit will clear the DTX1ST bit if it is 
set. Writing a logic 0 to the DTX1STR has no effect. Reset clears this 
bit.

RP0SIZ3-RP0SIZ0 — Embedded Device Endpoint 0 Receive Data 
Packet Size

These read only bits store the number of data bytes received for the 
last OUT or SETUP transaction for embedded device Endpoint 0. 
These bits are not affected by reset.