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CHAPTER 3 CPU
3.12.7 Stop Status
Stop status indicates the status that stops all internal clocks and oscillation circuit
operation. It can be minimized the power consumption.
■ Overview of Stop Status
Stop status indicates the status that stops all internal clocks and oscillation circuit operation. It can be
minimized the power consumption.
Transition to the stop status is performed as follow.
• Writing in standby control register (STCR) using the instruction
Returning from the stop status is performed one of the following.
• Interrupt request (only applies to peripherals where interrupt request can be generated even under stop
status)
• Applying the L level to the RST
pin
Under stop status, all internal clocks are stopped, so built-in peripherals other than those that can generate
interrupts for returning will be stopped.
■ Block Diagram of Stop Control Section
Figure 3.12-9 shows the block diagram of stop control section.
Figure 3.12-9 Block diagram of stop control section
STOP
Internal bus clock
Internal bus
Internal Interrupt
CPU Hold Enable
CPU Hold Request
STOP state display singal
Internal reset
Internal clock generation circuit
State decoder
State transition control circuit
Clock
generation
Internal
bus clock
generation
Internal
peripheral
clock
generation
Internal peripheral clock
Clok stop
request singal
Clok cancel
request singal
STOP state transition request signal
Stop signal
Clear
STCR
CPU clock