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19.1 Overview
The power consumption of the system can be effectively reduced by using the standby modes in combination and
selecting the appropriate mode for the application.
The available standby modes are listed in Table 19-1.
Mode
HALT mode
IDLE mode
STOP mode
Subclock operation mode
Sub-IDLE mode
Internal oscillation clock
Note 3
operation mode
Internal oscillation HALT
Note 3
mode
Notes 1. The PLL does not stop. To realize low power consumption, stop the PLL and then shift to the IDLE mode.
2. Change to the clock-through mode, stop the PLL, then shift to the STOP mode. For details, refer to
CHAPTER 5 CLOCK GENERATION FUNCTION.
3. For details of the internal oscillation clock operation mode and internal oscillation HALT mode, refer to
CHAPTER 21 CLOCK MONITOR.
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CHAPTER 19 STANDBY FUNCTION
Table 19-1. Standby Modes
Mode to stop only the operating clock of the CPU
Mode to stop all the operations of the internal circuits except the oscillator
Mode to stop all the operations of the internal circuits except the subclock oscillator
Mode to use the subclock as the internal system clock
Mode to stop all the operations of the internal circuits, except the oscillator, in the subclock
operation mode
Mode in which the internal system clock (f
the clock monitor function
Mode in which only the operating clock of the CPU (f
clock operation mode
User's Manual U16896EJ2V0UD
Functional Outline
) operates on the internal oscillation clock by using
CLK
) is stopped in the internal oscillation
CPU
Note 1
Note 2
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