Fujitsu FR81S User Manual
CHAPTER 30: POWER CONSUMPTION CONTROL
5. Operation
FUJITSU SEMICONDUCTOR LIMITED
CHAPTER : POWER CONSUMPTION CONTROL
FUJITSU SEMICONDUCTOR CONFIDENTIAL
32
5.5. Standby Mode : Watch Mode with power-shutdown
This section describes standby mode : watch mode with power-shutdown.
Watch mode with power-shutdown is the mode to continue oscillation only for the specific clock and to
continue counting the clock timer corresponding to that clock while power supply to the microcontroller is
shut off. When the sub clock (SBCLK) is selected as the clock source, only the sub clock oscillates and only
the sub timer counts.
Notes:
⋅
Enter the device into the standby mode only when main RUN or sub RUN is in progress. For the
operation at a transition from the PLL-run state to its standby mode, see "5.9 Transition to Illegal Standby
Mode".
⋅
Transition to the standby mode while the FLASH memory is being programmed / erased is prohibited.
MB91520 Series
MN705-00010-1v0-E
1119