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| 型号： | M66596WG |
| 元件分类： | 总线控制器 |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PBGA64 |
| 封装： | 0.80 MM PITCH, FBGA-64 |
| 文件页数： | 83/133页 |
| 文件大小： | 1611K |
| 代理商： | M66596WG |
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M66596FP/WG
rev .1.00
2006.3.14
page 51 of 127
3.1.7
Low power consumption control
3.1.7.1 Overview of Low-power sleep state
In order to reduce power consumption, the controller is equipped with a function for setting a low-power sleep
state.
Controlling the clock and the low-power sleep state enables reduced power consumption when communication is not
being carried out, such as in the suspended state or disconnected state. In order to coordinate the relationship
between the controller clock supply being enabled and disabled in low-power sleep state, the values shown in Table
3.3 indicate the correspondence between the controller state and the value of the SYSCFG register, while Figure
3.3 shows the transitions in the controller state.
For the timing at which the transitions between the various states take place, and the register control timing, please
refer to 3.1.8 .
Table 3.3 Correspondence between the controller state and SYSCFG register value
Controller state
Values of the various SYSCFG register bits
Explanation
H/W reset
XTAL=0, XCKE=0, RCKE=0, PLLC=0, SCKE=0,
ATCKM=0, HSE=0, DPRPD=0, DPRPU=0,
FSRPC=0, PCUT=0, USBE=0
Normal operating state
PCUT=0, USBE=1
In this state, the clock is supplied to
the controller, and USB
communication is enabled.
Low-power sleep state
XTAL=xx *1), XCKE=0, RCKE=0, PLLC=0,
In this state, USB communication is
not carried out, such as when
communication is suspended or a
cable is disconnected.
*1) x indicates that the value is set by the user is retained.
H/W reset
Low-power sleep
Normal operating
state
Suspended,
detached
Resume,
attached
Default setting
Attached
Figure 3.3 Controller state transitions (using low-power sleep state)
At the Hsot mode, if Remote Wake Up signal is received when suspend state, it is necessary to supply an internal
clock (SCKE) within 1ms after signal detection, and to start a resume signal output. For this reason, when you
enable Remote Wake Up , do not stop the internal clock, and a setup of a Low-power sleep state.
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