ST7L05 datasheet(32/104 Pages) STMICROELECTRONICS

Part #	ST7L05

Description	8-bit MCU for automotive with single voltage Flash memory, data EEPROM, ADC, timers, SPI

PDF	104 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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32 / 104 page

ST7L05, ST7L09

32/104

POWER SAVING MODES (Cont’d)

9.3 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’ instruction.

All peripherals remain active. During WAIT mode,

the I bit of the CC register is cleared, 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 Pro-

gram 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 18.

Figure 18. WAIT Mode Flowchart

Notes:

1. Before servicing an interrupt, the CC register is pushed

on the stack. The I bit of the CC register is set during the

interrupt routine and cleared when the CC register is

popped

WFI INSTRUCTION

RESET

INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

IBIT

OFF

FETCH RESET VECTOR

OR SERVICE INTERRUPT

CPU

OSCILLATOR

PERIPHERALS

IBIT

OFF

CPU

OSCILLATOR

PERIPHERALS

IBIT

X1)

256 CPU CLOCK CYCLE

DELAY

ST7L05 Datasheet(PDF) 32 Page - STMicroelectronics

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