ST72F262G2B5 datasheet(34/172 Pages) STMICROELECTRONICS

Part #	ST72F262G2B5

Description	8-BIT MCU WITH FLASH OR ROM MEMORY, ADC, TWO 16-BIT TIMERS, I2C, SPI, SCI INTERFACES

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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ST72260Gx, ST72262Gx, ST72264Gx

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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 22.

Figure 22. 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

Y

N

Y

CPU

OSCILLATOR

PERIPHERALS

I[1:0] BITS

ON

0

OFF

FETCH RESET VECTOR

OR SERVICE INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

I[1:0] BITS

ON

OFF

1

ON

CPU

OSCILLATOR

PERIPHERALS

I[1:0] BITS

ON

XX 1)

ON

4096 CPU CLOCK CYCLE

DELAY

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ST72F262G2B5 Datasheet(PDF) 34 Page - STMicroelectronics

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