MC68HC908LD64 Datasheet, PDF (207/362 Pages) Freescale Semiconductor, Inc – Microcontrollers

Universal Serial Bus Module (USB)
Hub Function I/O Registers
is no status change to be reported to the host through endpoint 1. If
this bit is 0, a NAK handshake will be returned for next IN token for
hub endpoint 1. Reset clears this bit.
1 = Port status change bitmap is ready to be sent
0 = Port status does not change; respond with NAK
PCHG5–PCHG0 — Hub and Port Status Change Bitmap
These read/write bits report the status change for the hub, embedded
device and the four downstream ports. The status change bitmap is
returned to the host through the hub endpoint 1 if the PNEW bit is 1.
These bits are cleared by reset.
Bit Name
PCHG0
PCHG1
PCHG2
PCHG3
PCHG4
PCHG5
Function
Hub status change
Port 1 status change
Port 2 status change
Port 3 status change
Port 4 status change
Embedded device
status change
Value
0
1
0
1
0
1
0
1
0
1
0
1
Description
No status change in hub
Hub status change detected
No status change in Port 1
Port 1 status change detected
No status change in Port 2
Port 2 status change detected
No status change in Port 3
Port 3 status change detected
No status change in Port 4
Port 4 status change detected
No status change in
embedded device
Embedded device status
change detected
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
Universal Serial Bus Module (USB)
Data Sheet
207