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CHAPTER 11 USB FUNCTION
11.3 Registers of USB Function
Note:
The RST bit initializes the corresponding bits of the timestamp register, UDC status register, and
interrupt enable register at once. In addition, since it sets EP0I, EP0O, and BFINIs of EP1 to EP5
status registers at the same time after initialization, clear the RST bit (which does not clear the BFINI
bits), and clear the BFINI of an endpoint to be used in this sequence.
[bit6] RESUM: Resume setting bit
When it is in remote Wake-up enabled status (or DEVICE_REMOTE_WAKEUP bit is set with the
SET_FEATURE command by the host) and in suspend status, the resume operation is started by writing
"1" to the RESUM bit. Clear the resume direction by writing "0" to the RESUM bit that was set to "1".
RESUM
0
1
[bit5] HCON: Host connection bit
Control a switch between an external pull-up resistor and the USB data line and allows the USB
Function to recognize connections to HOST PC or HUB.
HCON
0
1
Note:
Even if the external pull-up resistor is HOST at the state of ON or the connection is recognized from
the HUB, the bus reset and the command of the USB bus ignores when the HCON bit is set to "1".
[bit4] USTP:USB operation clock stop bit
Stop the clock of the USB operation part by setting the USTP bit. Setting the USTP bit can reduce
power consumption when keeping the USB out of service.
USTP
0
1
200
USB resume start dictating bit release
HOST PC or HUB and connection
HOST PC or HUB and state of cutting
Clock stop of USB operation part
FUJITSU MICROELECTRONICS LIMITED
Operating mode
USB resume start dictate
Operating mode
Operating mode
Normal mode
MB90335 Series
CM44-10137-6E
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