Fujitsu MB96300 series Hardware Manual page 793

F2mc-16fx 16-bit

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Table 30.4-2 Suspend Setting

They are "0" writing at "1" state.

• This bit selects the operating clock of the USB.

• This bit can only be modified while UDCC:RST bit is set to

"1" and the host mode is enabled.

• This bit indicates if the SOF timer is operating.

• Clearing this bit stops SOF of being sent.

• This bit is updated after the UDCC:RST bit is set to "0".

• This bit sets the suspend status.

• Writing "1" to the bit enables suspend status.

• Writing "0" to this bit or a change of USB bus to the k-state

status deselects the suspend status. HIRQ:RWKIRQ must

be set in this case.

• This bit must be cleared when detecting connection or

disconnection. Then the HIRQ:RWKIRQ bit must be set

twice (overwrite the RWKIRQ bit with "1" when it is set to

• It is forbidden to set the bit to "1" while the USB is

operating (such as resetting the USB bus or sending/

receiving data).

• In host mode, it is forbidden to stop the USB clock even in

suspend status.

• To update it, the UDCC:RST bit must be set to "0".

• if set to "1" before changing the mode from host to device

mode, the suspend status must be canceled by clearing

• This bit indicates the transfer mode.

• It is not initialized with the UDCC:RST bit.

• Do set the CPU clock at 24 MHz

• This bit indicates whether a device is connected or not.

• It is not initialized with the UDCC:RST bit.

CHAPTER 30 USB Mini-host

State maintenance