ST72C171 datasheet(28/152 Pages) STMICROELECTRONICS

No de pièce	ST72C171

Description	8-BIT MCU with 8K FLASH, ADC, WDG, SPI, SCI, TIMERS SPGAs Software Programmable Gain Amplifiers, OP-AMP

PDF	152 Pages

Scroll/Zoom	100%

Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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ST72C171

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POWER SAVING MODES (Cont’d)

6.3 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 are forced to 0, to ena-

ble all interrupts. All other registers and memory

remain 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 22.

Figure 22. WAIT Mode Flow-chart

Note: Before servicing an interrupt, the CC regis-

ter is pushed on the stack. The I bit of the CC reg-

ister is set during the interrupt routine and cleared

when the CC register is popped.

WFI INSTRUCTION

RESET

INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

I BIT

OFF

FETCH RESET VECTOR

OR SERVICE INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

I BIT

OFF

CPU

OSCILLATOR

PERIPHERALS

I BIT (see note)

4096 CPU CLOCK CYCLE

DELAY

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