ST7MC1K2 datasheet(73/371 Pages) STMICROELECTRONICS

73 / 371 page

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Power saving modes

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8.3

Wait mode

Wait mode places the MCU in a low power consumption mode by stopping the CPU.

This power saving mode is selected by calling the ‘WFI’ instruction.

All peripherals remain active. During Wait mode, the I[1:0] bits of the CC register are forced

to ‘10’, to enable all interrupts. All other registers and memory remain unchanged. The MCU

remains in Wait mode until an interrupt or reset occurs, whereupon the program counter

branches to the starting address of the interrupt or reset service routine.

The MCU remains in Wait mode until a reset or an interrupt occurs, causing it to wake up.

Refer to Figure 23.

Figure 23.

Wait mode flow-chart

Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are

set to the current software priority level of the interrupt routine and recovered when the CC register is

popped.

WFI instruction

Reset

Interrupt

CPU

Oscillator

Peripherals

I[1:0] bits

Off

Fetch reset vector or

service interrupt

256 or 4096 CPU clock

cycle delay

CPU

Oscillator

Peripherals

I[1:0] bits

Off

CPU

Oscillator

Peripherals

I[1:0] bits

XX(1)

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