ST72F324J2TCRE 查看數據表（PDF） - STMicroelectronics

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ST72F324J2TCRE

8-bit MCU for automotive, 3.8 to 5.5V operating range with 8 to 32 Kbyte Flash, 10-bit ADC, 4 timers, SPI, SCI

STMicroelectronics 

Power saving modes

ST72324xx-Auto

Figure 22. Slow mode clock transitions

fCPU

fOSC2/2

fOSC2/4

fOSC2

CP1:0 00

01

SMS

fOSC2

New Slow

frequency

request

Normal Run mode request

Obsolete Product(s) - Obsolete Product(s) 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

Figure 23.

Figure 23. Wait mode flowchart

WFI instruction

Oscillator

on

Peripherals

on

CPU

off

I[1:0] bits

10

N

Reset

N

Y

Interrupt

Y

Oscillator

on

Peripherals

off

CPU

on

I[1:0] bits

10

256 or 4096 CPU clock

cycle delay

Oscillator

Peripherals

CPU

I[1:0] bits

on

on

on

XX(1)

Fetch reset vector

or service interrupt

1. Before servicing an interrupt, the CC register is pushed on the stack. The I[1:0] bits of the CC register are

set to the current software priority level of the interrupt routine and recovered when the CC register is

popped.

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Doc ID 13841 Rev 1

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