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USB DEVICE S3C2440A RISC MICROPROCESSOR
13-6
POWER MANAGEMENT REGISTER (PWR_REG)
This register acts as a power control register in the USB block.
Register Address R/W Description Reset Value
PWR_REG 0x52000144(L)
0x52000147(B)
R/W
(byte)
Power management register 0x00
PWR_ADDR Bit MCU USB Description Initial
State
Reserved [7:4] - - - -
USB_RESET [3] R SET Set by the USB if reset signaling is received from
the host. This bit remains set as long as reset
signaling persists on the bus
0
MCU_RESUME [2] R/W R
/CLEAR
Set by the MCU for MCU Resume.
The USB generates the resume signaling during
10ms, if this bit is set in suspend mode.
SUSPEND_MODE [1] R SET
/CLEAR
Set by USB automatically when the device enter
into suspend mode.
It is cleared under the following conditions:
1) The MCU clears the MCU_RESUME bit by
writing ‘0’, in order to end remote resume
signaling.
2) The resume signal from host is received.
0
SUSPEND_EN [0] R/W R Suspend mode enable control bit
0 = Disable (default). The device will not enter
suspend mode.
1 = Enable suspend mode
0