EAGLE
PRELIMINARY
Ver 1.3
3.22.2 USB Control Registers
3.22.2.1 USB Function Address Register (USBFA)
Address : 0xFFE0_9800h
R/W
MCU USB
Default
Value
Bit
Description
31 : 8
7
R
R/W
Reserved
ADDUP : ADDR_UPDATE bit.
-
0b
R/
Clear
MCU sets this bit whenever it updates the FUNCTION_ ADDR
field in this register. The FUNCTION_ADDR field is used after
the status phase of a control transfer, which is signaled by the
clearing of the DATA_END bit in the Endpoint 0 CSR.
FUNADD : FUNCTION_ADDR bit.
6 : 0
R/W
R
00h
MCU writes the address here.
3.22.2.2 USB Power Management Register (USBPM)
Address : 0xFFE0_9804h
R/W
MCU USB
Default
Value
-
Bit
Description
31 : 4
3
R
R
Reserved
UBRST : USB_RESET bit.
Set
0b
USB sets this bit when Reset signal is received from host.
This bit remains set for as long as the reset signal is asserted in
bus.
2
1
W/R
R
R
UBRSUM : USB_RESUME bit.
0b
0b
MCU sets this bit for 10ms (Max. 15ms) to initialize the resume
signal. In suspend mode, USB generates the resume signal for the
duration that this bit is set.
R/W UBSPDMOD : SUSPEND_MODE bit.
When suspend mode is entered, USB sets this bit.
This bit is cleared by the following conditions.
-
When MCU clears UC_RESUME to terminate resume
signal.
-
When the resume signal is received from host.
0
R/W
R
UBENSPD : ENABLE_SUSPEND bit
= 1 Enable Suspend mode
0b
= 0 Disable Suspend mode (Default)
If this bit is zero, USB devices will not enter suspend mode.
Beijing Peak Microtech Co.Ltd.
CONFIDENTIAL
176
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