ST7MC1K2-Auto datasheet(72/371 Pages) STMICROELECTRONICS

Teilenummer	ST7MC1K2-Auto

Bauteilbeschribung	Clock, reset and supply management

PDF	371 Pages

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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Power saving modes

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

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8.2

Slow mode

This mode has two targets:

●

To reduce power consumption by decreasing the internal clock in the device,

●

To adapt the internal clock frequency (fCPU) to the available supply voltage.

SLOW mode is controlled by three bits in the MCCSR register: the SMS bit enables or

disables SLOW mode and two CPx bits select the internal slow frequency (fCPU).

In this mode, the master clock frequency (fOSC2) can be divided by 2, 4, 8 or 16. The CPU

and peripherals are clocked at this lower frequency (fCPU).

Note:

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

Slow mode.

Figure 22.

SLOW mode clock transitions

SMS

CP1:0

fCPU

New SLOW

Normal run mode

MCCSR

frequency

request

fOSC2

fOSC2/2

fOSC2/4

fOSC2

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ST7MC1K2-Auto Datenblatt(PDF) 72 Page - STMicroelectronics