ST72260G datasheet(34/171 Pages) STMICROELECTRONICS

34 / 171 page

ST72260G, ST72262G, ST72264G

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POWER SAVING MODES (Cont’d)

8.3 WAIT MODE

WAIT mode places the MCU in a low power con-

sumption mode by stopping the CPU.

This power saving mode is selected by calling the

“WFI” ST7 software instruction.

All peripherals remain active. During WAIT mode,

the I [1:0] bits in the CC register are forced to ‘10b’,

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 23.

Figure 23. WAIT Mode Flowchart

Note:

1. Before servicing an interrupt, the CC register is

pushed on the stack. The I[1:0] bits in the CC reg-

ister are set during the interrupt routine and

cleared when the CC register is popped.

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)

4096 CPU CLOCK CYCLE

DELAY

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