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ST72334J Arkusz danych(PDF) 41 Page - STMicroelectronics

Numer części ST72334J
Szczegółowy opis  8-BIT MCU WITH SINGLE VOLTAGE FLASH MEMORY, ADC, 16-BIT TIMERS, SPI, SCI INTERFACES
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72334J Arkusz danych(HTML) 41 Page - STMicroelectronics

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POWER SAVING MODES (Cont’d)
5.2.4 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
MISCR1 register: the SMS bit which enables or
disables Slow mode and two CPx bits which select
the internal slow frequency (fCPU).
In this mode, the oscillator frequency can be divid-
ed by 4, 8, 16 or 32 instead of 2 in normal operat-
ing mode. The CPU and peripherals are clocked at
this lower frequency.
Note: SLOW-WAIT mode is activated when enter-
ring the WAIT mode while the device is already in
SLOW mode.
Figure 31. SLOW Mode: timing diagram for internal CPU clock transitions
00
01
0
1
SMS
CP1:0
fCPU
fOSC/8
fOSC/4
NEW FREQUENCY
REQUEST
NEW FREQUENCY
ACTIV E WHEN
OSC/4 & OSC/8 = 0
NORMAL MODE
REQUEST
NORMAL MODE ACTIVE
(OSC/4, OSC/8 STOPPED )
MISCR1
REGISTE R


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