ST7LUS5 datasheet(45/124 Pages) STMICROELECTRONICS

Part #	ST7LUS5

Description	8-bit low cost, low pin-count MCU for automotive,with single voltage Flash memory, ADC, timers

PDF	124 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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45 / 124 page

ST7LUS5, ST7LU05, ST7LU09

Power saving modes

45/124

In this mode, the oscillator frequency is divided by 32. The CPU and peripherals are clocked

at this lower frequency.

Note:

Slow Wait mode is activated when entering Wait mode while the device is already in Slow

mode.

Figure 17.

Slow mode clock transition

8.3

Wait mode

Wait mode places the MCU in a low power consumption 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 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 18 on page 46.

SMS

fCPU

NORMAL RUN MODE

REQUEST

fOSC

fOSC/32

fOSC

ST7LUS5 Datasheet(PDF) 45 Page - STMicroelectronics