R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 112
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R8A66597BG
Manufacturer Part Number
R8A66597BG
Description
ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R8A66597BG.pdf
(185 pages)
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R8A66597FP/DFP/BG
3.1.9
3.1.9.1 Power Consumption Control Outline
R e v 1 . 0 1
Power-Consumption Control
The R8A66597 controller offers two types of low-consumption power supply: Low Power Sleep State and Vcc-OFF
State. Table 3.6 provides a description of each low-power consumption state.
Figure 3.1 shows a diagram of the controller status transitions.
Low Power
Sleep State
Vcc-OFF State
Controller State
O c t 1 7 , 2 0 0 8
1) Recovery Event:
The controller transitions to the low-power sleep state when “LPSME=1” is set during
initialization, and the clock is stopped in the current controller operation state (refer to
3.1.10.2). The value of each register is maintained, but the contents of the FIFO buffer are
not saved.
The controller can be transitioned to the Vcc-OFF state by turning off only Vcc while
keeping VIF on. This state reduces power consumption even further than that of the
low-power sleep state.
The values in the registers are not saved.
VCC, AVCC
on
p a g e 1 1 2 o f 1 8 3
Figure 3.1 Controller State Transition Diagram
(when “a ttach” etc.
VCC or AVCC off
(VIF remains on)
Table 3.6 Low Power Consumption States
Initialization
VCC, AVCC, VIF on
is detected)
CS_N signal is asserted by CPU dummy read when “PCSDIS=1” or
detection of RESM interrupt when “RSME=1”, or
detection of VBINT interrupt when “VBSE=1”, or
detection of BCHG interrupt when “BCHGE=1”.
Normal operating
after H/W reset
VCC OFF state
Initialized state
state
H/W Reset
Description
Recovery event
Stop clock
sequence completed
Only VCC off
(VIF remains ON)
*1)
Low-power sleep
state
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