ST72334J datasheet(40/125 Pages) STMICROELECTRONICS

Numer części	ST72334J

Szczegółowy opis	8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES

PDF	125 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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40 / 125 page

ST72334J/N, ST72314J/N, ST72124J

40/125

POWER SAVING MODES (Cont’d)

5.2.3 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 I bit of the CC register is forced to 0 to enable

all interrupts. All other registers and memory re-

main unchanged. The MCU remains in WAIT

mode until an interrupt or Reset occurs, whereup-

on 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 30.

Figure 30. WAIT mode flow-chart

WFI INSTRUCTION

RESE T

INTERRUPT

CPU

OSCILLATOR

PERIPHERA LS

I BIT

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 INTER RUPT**

CPU

OSCILLATOR

PERIPHERALS

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