ST72324BJ2 datasheet(48/188 Pages) STMICROELECTRONICS

48 / 188 page

Power saving modes

ST72324B

48/188

Figure 24.

Slow mode clock transitions

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 will

remain in Wait mode until a reset or an interrupt occurs, causing it to wake up. Refer to

Figure 25.

Wait mode flowchart

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.

SMS

CP1:0

fCPU

New Slow

Normal Run mode

frequency

request

fOSC2

fOSC2/2

fOSC2/4

fOSC2

WFI instruction

Reset

Interrupt

CPU

Oscillator

Peripherals

I[1:0] bits

off

Fetch reset vector

or service interrupt

CPU

Oscillator

Peripherals

I[1:0] bits

off

CPU

Oscillator

Peripherals

I[1:0] bits

XX(1)

256 or 4096 CPU clock

cycle delay

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