M66596FP datasheet(52/131 Pages) RENESAS

52 / 131 page

M66596FP/WG

rev .1.00

2006.3.14

page 52 of 127

3.1.7.2 Overview of Clock stop state

This controller is equipped with the setting function of the low power consumption state by clock stop as well as

M66291, M66591, and M66592. Software is transplantable for this controller from M66291, M66591, and M66592 by

fewer changes.

In the states where the controller is not communicating such as suspend and a not connect state, low power

consumption by clock stop is realized. Correspondence of the state of the controller and the value of a SYSCFG

the transitions between the various states take place, and the register control timing, please refer to 3.1.8.

Moreover, when you use the low power consumption state by clock stop, please use the auto clock supply function

("ATCKM=1").

Table 3.4 Correspondence betweek the controller state and SYSCFG register value

Controller state

Values of the various SYSCFG register bits

Explanation

H/W reset

XTAL=00,XCKE=0,RCKE=0,PLLC=0,SCKE=0,ATK

CM=0,HSE=0,DPRPU=0,FSRPC=0,PCUT=0,USB

E=0

Normal operating state

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

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

*1),DPRPD=x*1),DPRPU=x*1),FSRPC=x,PCUT=0,

USBE=1

In this state, the clock is supplied to

the controller, and USB

communication is enabled.

Clock stop state

XTAL=xx

*1),XCKE=0,RCKE=0,PLLC=0,SCKE=0,ATCKM=1

,HSE= x

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

=0,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

Clock stop

Normal operating

state

Suspend,

Detached

Resume,

Attached

Default setting,

Attached

Figure 3.4 Controller state transitions(Clock stop mode)

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