ST72321BR9-AUTO View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

ST72321BR9-AUTO

8-bit MCU for automotive with 32 to 60 Kbyte Flash/ROM, ADC, 5 timers, SPI, SCI, I2C interface

STMicroelectronics 

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Power saving modes

Figure 23. Slow mode clock transitions

fCPU

fOSC2/2

ST72321Bxxx-Auto

fOSC2/4

fOSC2

fOSC2

CP1:0

00

01

SMS

NEW SLOW

FREQUENCY

REQUEST

NORMAL RUN MODE

REQUEST

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.

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