MC68HC908LD64 Datasheet, PDF (206/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
RXE — Hub Endpoint 0 Receive Enable
This read/write bit enables a receive to occur when the USB host
controller sends an OUT token to the hub endpoint 0. Software should
set this bit when data is ready to be received. It must be cleared by
software when data cannot be received. If this bit is 0 or the RXDF is
set, the USB will respond with a NAK handshake to any hub
endpoint 0 OUT tokens. Reset clears this bit.
1 = Data is ready to be received
0 = Not ready for data; respond with NAK
TPSIZ[3:0] — Hub Endpoint 0 Transmit Data Packet Size
These read/write bits store the number of transmit data bytes for the
next IN token request for hub endpoint 0. These bits are cleared by
reset.
14.6.8 USB Hub Endpoint 1 Control and Data Register (HCDR)
Address: $005C
Bit 7
6
5
4
3
2
1
Bit 0
Read:
STALL1
Write:
PNEW
PCHG5
PCHG4
PCHG3
PCHG2
PCHG1
PCHG0
Reset: 0
0
0
0
0
0
0
0
Figure 14-10. USB Hub Endpoint 1 Control and Data Register (HCDR)
STALL1 — Hub Endpoint 1 Force Stall Bit
This read/write bit causes hub endpoint 1 to return a STALL
handshake when polled by the host. Reset clears this bit.
1 = Send STALL handshake
0 = Default
PNEW — Port New Status Change
This read/write bit enables a transmit to occur when the USB Host
controller sends an IN token to hub endpoint 1. Software should set
this bit when there is a status change on any of the downstream ports,
embedded device or hub. It must be cleared by software when there
Data Sheet
206
Universal Serial Bus Module (USB)
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor