M68HC08 datasheet(176/288 Pages) FREESCALE

176 / 288 page

Universal Serial Bus Module (USB)

Data Sheet

MC68HC908BD48 — Rev. 2.1

176

Universal Serial Bus Module (USB)

Freescale Semiconductor

RSEQ — Received Data Sequence

This bit indicates the type of data packet of the last received data

packet on endpoint 0. RSEQ = 0 indicates the last received data

packet is type DATA0. RSEQ = 1 indicates the last received data

packet is type DATA1.

1 = Last token received on endpoint 0 is a DATA1 token

0 = Last token received on endpoint 0 is a DATA0 token

SETUP — SETUP Token

This bit is set when the received token packet for endpoint 0 is a

SETUP token (PID = b1101).

1 = Last token received on endpoint 0 is a SETUP token

0 = Last token received on endpoint 0 is not a SETUP token

TX1ST — Transmit First Flag

This bit is set if the endpoint 0 transmit buffer empty flag (TBEF) is set

when the control logic is setting the endpoint 0 receive buffer full flag

(RBFF). This happens when TBEF is still set at the end of an

endpoint 0 reception.

1 = IN transaction occurred before SETUP or OUT

0 = IN transaction occurred after SETUP or OUT

RPSIZ[3:0] — Received Data Size

The RPSIZ[3:0] indicates the number of received data bytes in a data

packet. Reset will not affect these bits

M68HC08 Datasheet(PDF) 176 Page - Freescale Semiconductor, Inc