Fujitsu FR81S ユーザーズマニュアル
CHAPTER 30: POWER CONSUMPTION CONTROL
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : POWER CONSUMPTION CONTROL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
53
5.10. Restrictions on Power-Shutdown and Normal Standby
Control
Restrictions on power-shutdown and normal standby control are described below.
The microcontroller does not perform standby control under the following conditions:
⋅
When the CPU is operating with PLL
⋅
When the OCD is being enabled to operate
⋅
When missing the clock by CSV function *2, *3.
The standby control does not operate in the states above, but the CPU is in the standby state.
Figure 5-6 Restriction on Power-Shutdown and Normal Standby Control
*1:
This state is not recognized as power-shutdown and the state that the CPU transits to standby mode.
*2: It is the case when stop of operating clock source are detected by CSV circuit. For instance, in the case
that the CPU operates with the CR clock after main clock stop are detected, the CPU does not perform
standby control. However, it is not the limitation case, when stop detection of sub-clock is done while
the CPU run with the main clock.
Detecting CSV
*1
SHDE=1
Normal Standby
CSV check
Power-shutdown
Microcontroller
operation
Standby(Power-shutdown)
transition instruction
OCD connection
Operate by PLL clock
Standby(Power-shutdown)
transition wait
STOP=0 and
TIMER=0
TIMER=0
STOP=1 or
TIMER=1
TIMER=1
No detecting CSV
SHDE check
Microcontroller
Stop
SHDE=0
Illegal check
MB91520 Series
MN705-00010-1v0-E
1140