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ST72321BXXX-AUTO Datasheet(PDF) 68 Page - STMicroelectronics

Part # ST72321BXXX-AUTO
Description  8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72321BXXX-AUTO Datasheet(HTML) 68 Page - STMicroelectronics

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Power saving modes
ST72321Bxxx-Auto
68/247
Figure 23.
Slow mode clock transitions
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[1:0] bits of the CC register are forced
to ‘10’, 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 the following Figure 24.
00
01
SMS
CP1:0
fCPU
NEW SLOW
NORMAL RUN MODE
FREQUENCY
REQUEST
REQUEST
fOSC2
fOSC2/2
fOSC2/4
fOSC2


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