Samsung S3C2440A User Manual
Page 334
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