M66596FP datasheet(51/131 Pages) RENESAS

51 / 131 page

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

XTAL=xx *1), XCKE=1, RCKE=1, PLLC=x *1),

SCKE=1, ATCKM=x *1), HSE=x *1), DPRPD=x*1),

DPRPU=x *1), FSRPC=x *1),

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,

SCKE=0, ATCKM=x *1), HSE= x *1), DPRPD=x*1),

DPRPU=x *1), FSRPC=x *1), PCUT=1, USBE=1

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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