ST7LITE20F2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST7LITE20F2

8-bit microcontroller with single voltage Flash memory, data EEPROM, ADC, Timers, SPI

STMicroelectronics 

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Power saving modes

Note:

SLOW mode is controlled by the SMS bit in the MCCSR register which enables or disables

SLOW mode.

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

at this lower frequency.

SLOW-WAIT mode is activated when entering WAIT mode while the device is already in

SLOW mode.

Figure 22. SLOW mode clock transition

fCPU

fOSC/32

fOSC

fOSC

SMS

Normal Run mode

request

9.3

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 23.

Doc ID 8349 Rev 5

53/166

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