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Operation of Low Power Consumption Mode

Simulation : [Clock switching] [Operation in the low-power consumption mode] [Execution order of the exception processing]

The microcomputer has many function blocks; it is possible to stop some functions and reduce power consumption by intercepting the power supply. 
Select the low-power consumption mode. The function list will show operation and stop states in the selected low-power consumption mode.

Low-power consumption mode selection

Mode Instruction Operation Low-power-consumption
NORMAL Execute This mode is to operate the CPU core and the peripheral circuits by using the high-speed clock. It is shifted to the NORMAL mode after reset. Highest
IDLE Stop Only the CPU is stopped in this mode. Each peripheral circuit can be operated by setting the registers. The mode returns to the NORMAL mode by an interrupt from operating peripheral circuit, and moves to process for the interrupt. High
STOP1 Stop Except some peripheral circuits, all the internal circuits including the internal oscillator are brought to a stop in this mode.
The mode is brought back to the NORMAL mode by the external interrupts (INT0-INTB and NMI) or interrupts from the operating peripheral circuits. After the completion of the warming-up oscillation, the processing shifts to the interrupt.
STOP2 Stop This mode halts voltage supply, retaining some peripheral circuits operation. This enables to reduce power consumption significantly compares to STOP1 mode.
The mode is bourght back to the NORMAL mode by the external interrupt (INT0-INTB, and NMI) or the interrupt from the operating peripheral circuit. After the completion of the warming-up oscillation, the processing shifts to the interrupt.

List of functions operating in the low-power consumption mode

  • The "Stop (processing required)" needs that peripheral circuits be stopped by software before shifting to the target mode.
  • The "Stop (power-off)" automatically cuts the power supplied to peripheral circuits when mode shifts to target mode.
Function Execute Stop Stop (processing required) Stop (power-off) Stop (processing required/power-off)
µDMA controller(DMAC)
Input / Output Port(GPIO)
Analog / Digital Converter(ADC)
Digital Analog Converter(DAC)
USB Host Controller(USBH)
USB Device Controller(USBD)
Ethernet controller(EtherMAC)
CAN Controller(CAN)
Synchronous Serial Port(SSP)
Serial Channel(SIO/UART)
Serial Bus Interface(I2C/SIO)
Watchdog Timer(WDT)
16-bit Timer / Event Counters(TMRB)
16-bit Multi-Purpose Timer(MPT)
Encoder Input Circuit(ENC)
Remote control signal preprocessor(RMC)
Real Time Clock(RTC)
Power-on-Reset Circuit(POR)
Low Voltage Detection Circuit(LVD)
External bus interface(BUS)
Clock/Mode control(CG)
Clock Multiplication Circuit(PLL)
Oscillation Frequency Detector(OFD)
External high-speed oscillator
External low-speed oscillator
Internal high-speed oscillator 1
Internal high-speed oscillator 2
Backup RAM
Main RAM
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