Fujitsu mb91192 Manuale Utente
73
3.12.8
Sleep Status
Sleep status indicates that the CPU clock and internal bus clock are stopped.
Power consumption under the status where CPU operation is not required can be
reduced in some extent.
Power consumption under the status where CPU operation is not required can be
reduced in some extent.
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Overview of Sleep Status
Sleep status indicates that the CPU clock and internal bus clock are stopped.
Power consumption under the status where CPU operation is not required can be reduced in some extent.
The transition to the sleep status is performed as follow.
•
Writing in standby control register (STCR) using the instruction
Returning from the sleep status is performed one of the following.
•
Interrupt request
•
Reset factor generation
Under sleep status, the peripheral clock operates, so reset is possible by interrupt of built-in peripheral.
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Block Diagram of Sleep Control Section
Figure 3.12-10 shows the block diagram of the sleep control section.
Figure 3.12-10 Block diagram of sleep control section
SLEP
Internal bus clock
Internal bus
Internal Interrupt
STOP state display singal
Internal reset
Internal clock generation circuit
State decoder
State transition control circuit
Clock
generation
generation
Internal
bus clock
generation
bus clock
generation
Internal
peripheral
clock
generation
peripheral
clock
generation
Internal peripheral clock
Clok stop
request singal
request singal
Clok cancel
request singal
request singal
Sleep state transition request signal
Stop signal
Clear
STCR
CPU clock