ST72589BW datasheet(31/158 Pages) STMICROELECTRONICS

部件名	ST72589BW

功能描述	8-BIT MCU WITH NESTED INTERRUPTS, DOT MATRIX LCD, ADC, TIMERS, PWM-BRM, SPI, SCI, I²C, CAN INTERFACES

PDF	158 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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31 / 158 page

ST72589BW, ST72389BW

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POWER SAVING MODES (Cont’d)

4.2.3 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 I1 and I0 bits of the CC register are forced to

level 0 (“10”), to enable all interrupts. All other reg-

isters and memory remain unchanged. The MCU

remains in WAIT mode until an interrupt or Reset

occurs, whereupon the Program Counter branch-

es 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 20.

Figure 20. WAIT mode flow-chart

WFI INSTRUCTION

RESET

INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

I1 AND I0 BITS

OFF

if exit caused by a RESET, a 4096 CPU

clock cycle delay is inserted.

CPU

OSCILLATOR

PERIPHERALS

OFF*

OFF

Note:

* The peripheral clock is stopped only when exit caused by RESET and not by an interrupt.

** Before servicing an interrupt, the CC register is pushed on the stack.

FETCH RESET VECTOR

OR SERVICE INTERRUPT**

CPU

OSCILLATOR

PERIPHERALS

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